What does the Bible say about fasting?
Fasting is the most overlooked spiritual practice in the modern church, and the one Jesus assumed his followers would do. This page walks what the Bible actually says — what fasting is, what it is not, and the kind of fast God chooses.
Three passages to anchor the practice
Read the verses, open a note, and then bring your own question below.
“Moreover when you fast, don't be like the hypocrites, with sad faces. For they disfigure their faces, that they may be seen by men to be fasting. Most certainly I tell you, they have received their reward. But you, when you fast, anoint your head, and wash your face, so that you are not seen by men to be fasting, but by your Father who is in secret, who is in secret; and your Father, who sees in secret, will reward you.”
Matthew 6:16-18 (WEB)
““Isn't this the fast that I have chosen: to loose the bonds of wickedness, to undo the bands of the yoke, and to let the oppressed go free, and that you break every yoke?”
Isaiah 58:6 (WEB)
“Jesus said to them, “Can the friends of the bridegroom mourn, as long as the bridegroom is with them? But the days will come when the bridegroom will be taken away from them, and then will they fast.””
Matthew 9:15 (WEB)
What would you be making room for if you laid down an appetite for a day?
Start here
The practice Jesus assumed we would keep
Fasting has a public-relations problem in the modern church, and it is largely of our own making. For a generation raised on convenience, the voluntary absence of a meal sounds either medieval or masochistic — the sort of thing ascetics do in monasteries, or the sort of thing people do to lose weight and call it spiritual. Both impressions are wrong, and both keep ordinary believers from one of the most powerful practices Jesus ever assumed his people would keep. The recovery of a biblical view of fasting begins with the recovery of the question: what does the Bible actually say about it?
The first surprise is how little Jesus commands it and how much he assumes it. In the Sermon on the Mount, in the very passage where he teaches the Lord's Prayer, Jesus says when you fast — not if. He groups fasting with giving and prayer as a default practice of the righteous, so matter-of-factly that he does not even argue for it. He simply presumes his disciples will do it, and then spends his energy telling them how not to do it wrongly. The implication is striking: fasting is not an advanced, optional discipline for the spiritually ambitious. It is baseline Christianity, and we have somehow managed to lose it.
The second surprise is what the Bible says fasting is for. It is not a diet, though it may benefit the body. It is not a hunger strike to twist God's arm, though it is often accompanied by urgent requests. It is not a performance to prove your devotion, though it requires real devotion. Fasting, in the Bible's grammar, is the voluntary laying down of a legitimate appetite — usually food — to make space for a greater hunger: hunger for God, for his will, for his direction, for his intervention. It is the body praying. It is the physical declaration that there is something you want more than you want lunch.
This page will walk the Bible's teaching on fasting in order. We start with what Jesus assumed in Matthew 6 — that his disciples would fast, and how. Then the passage everyone needs to read before they fast: Isaiah 58, where God tells his people there is a fast he chooses and a fast he rejects. Then Jesus's enigmatic word about the bridegroom, which tells us when and why fasting fits the age we live in. Then the early church's practice of fasting at decision points, which became the pattern for mission. We end with a practical, safe guide for beginning. The tool above lets you read the central passages. The prayer box below lets you bring your own situation to a thoughtful, Bible-first companion.
Lens one — when, not if
Jesus assumed his disciples would fast
In the Sermon on the Mount, fasting belongs with giving and prayer as a default practice. He does not argue for it; he presumes it, and tells us how not to do it wrongly.
Read the opening of Matthew 6:16 and notice the grammar. Jesus says, "Moreover when you fast, don't be like the hypocrites, with sad faces." The word when is doing a great deal of work. In the same sermon, Jesus has just said, when you give alms and when you pray. The three belong together as the expected practices of the disciple: giving, praying, fasting. He does not say if you fast, any more than he says if you pray. He presumes it, and moves directly to the warning that matters.
The warning is against the oldest temptation in religion: making the private practice visible so that people will be impressed. The hypocrites of Jesus's day made a theater of fasting — disfiguring their faces, walking about with ashes and gloom, making sure everyone knew how spiritual they were being. Jesus is scathing about it. They have their reward, he says — meaning the approval of men is the only reward they will get, because that is the reward they were actually after. The fast God honors is the fast no one knows about.
So his instruction is wonderfully ordinary. When you fast, anoint your head and wash your face. In the culture, oil on the head and a clean face were the marks of a normal, festive day. Jesus is saying: look like yourself. Do not broadcast it. Do not mope. Go about your business, do your work, tend your relationships, and let the fast be a thing between you and the Father who is in secret. And the Father who sees in secret will reward you. The reward is not specified, because the reward is himself — which is what the heart that fasts was actually hungry for.
Lens two — the fast God chooses
Isaiah 58 changes everything
The most important chapter in the Bible on the subject. God rejects the fast that stays in the stomach and chooses the fast that overflows into justice, mercy, and love.
Now the passage that prevents fasting from becoming just another religious performance. Isaiah 58 is the most important chapter in the Bible on the subject, and it works by contrast. God's people are complaining that they have fasted and God has not noticed. They have humbled themselves, they have bowed their heads, they have done the religious motions — and heaven has been silent. Why? The answer God gives them is one of the most searching passages in all of Scripture.
He tells them their fast is a fraud. On the day of your fast, he says, you find pleasure, and you exploit your workers. You fast for strife and contention, to smite with the fist of wickedness. You bow your heads like a reed and spread sackcloth and ashes under you — and you call that a fast, a day acceptable to the Lord? The problem is not the fasting. The problem is the fasting is disconnected from the rest of their lives. They are devout for an hour and cruel for the other twenty-three. The ritual is a lie because the life does not match it.
Then God names the fast he chooses, and it is breathtaking. "Isn't this the fast that I have chosen: to loose the bonds of wickedness, to undo the bands of the yoke, to let the oppressed go free, and that you break every yoke? Isn't it to distribute your bread to the hungry, and that you bring the poor who are cast out into your house? When you see the naked, that you cover him; and that you not hide yourself from your own flesh?" The fast God chooses is not only the absence of food. It is the presence of justice, mercy, generosity. It is a fast that flows out of the stomach and into the street. If your fasting does not make you more tender toward the poor, more honest in your dealings, more free with what you have — then it is the fast God rejects, no matter how devout it looks.
This does not mean fasting is only social action. It means true fasting always overflows. The hunger you feel in the body is meant to be transposed into hunger for righteousness — for God's will done on earth as it is in heaven, beginning with your own hands and wallet and relationships. The fast that begins in the stomach and ends in the stomach has missed the point. The fast that begins in the stomach and ends in a loosened bond, a fed neighbor, a freed heart — that is the fast God chooses, and his promise is that when you fast that way, your light will break out like the dawn.
Lens three — why we fast
The bridegroom has been taken away
Jesus's enigmatic word about a wedding explains why Christians fast in this age. It is the language of longing for the one who is coming back.
There is a puzzling moment in Matthew 9 that explains why Christians fast at all, and when. The disciples of John the Baptist come to Jesus and ask, essentially, why his disciples do not fast, when they and the Pharisees do. It is a fair question. Fasting was a regular practice of the devout in the first century, and Jesus's circle stood out by not joining in. His answer is one of the most beautiful images in the Gospels.
He says: "Can the friends of the bridegroom mourn, as long as the bridegroom is with them? But the days will come when the bridegroom will be taken away from them, and then will they fast." Jesus is the bridegroom, and his presence is a wedding feast. You do not fast at a wedding. The disciples were living in the unique season of walking with Jesus in the flesh, and that season was for joy, not for abstaining. But the day was coming when he would be taken from them — a veiled reference to his death, ascension, and return to the Father — and in that day, fasting would return.
That day is the day we live in. The bridegroom has been taken up; he is present with us by his Spirit, but he is also absent, and we await his return. This is why the Christian fasts — not to earn God's favor, not to manipulate him, but to express the ache of a bride waiting for her bridegroom. Every fast is a small, embodied prayer: Come, Lord Jesus. We want you here. The appetite we set aside is a way of saying that our deepest appetite is for him, and that the world as it is, is not yet the world as it will be. Fasting is the language of holy longing, and it is exactly fitted to the age between his ascension and his return.
Lens four — the early church
Fasting at the decision points
The book of Acts shows a community that had so habituated itself to God's presence that when direction was needed, the channel was already open.
The early church took this seriously, and the book of Acts shows us what it looked like in practice. At key decision points, the believers fasted and prayed together before moving. The pattern is striking because of how unforced it is — they do not seem to be following a rule. They are reaching for God in moments that matter, and fasting is the natural reflex.
The clearest example is in Acts 13. The church at Antioch is worshipping and fasting when the Holy Spirit speaks: set apart Barnabas and Saul for the work to which I have called them. They fast and pray again, lay hands on the two, and send them off — and that moment becomes the launch of the Gentile mission, the missionary movement that would carry the gospel across the known world. It was conceived in a fasting, worshipping community. The same pattern appears later when elders are appointed in the new churches: prayer and fasting precede the laying on of hands.
What this models is not a legalism — fast on these days, in these ways. It is a readiness. The early church had so habituated themselves to the presence of God through worship, prayer, and fasting that when direction was needed, the channel was already open. Fasting was part of how they listened. It sharpened their spiritual hearing, and it expressed the seriousness of their request. There is something about the voluntary laying down of an appetite that says to God: we are not asking lightly. We mean this. We will pay attention to whatever you say.
Lens five — how to begin
A practical, honest guide
The Bible's practice of fasting is more accessible than its reputation. Begin small, keep it hidden, pair it with prayer — and steward your body as the gift God made it.
How then does a person begin? The Bible's practice of fasting is more accessible than its reputation suggests, but it deserves a few honest cautions. First, fasting is the voluntary laying aside of food for a set time, in order to seek God more deliberately through prayer. It is not starvation, it is not a diet, and it is not an endurance test. The aim is not to suffer maximally but to make room for God. A fast can be short — skipping a single meal is a perfectly biblical fast — or it can extend for a day or more. Start small. The muscle grows with use.
Second, an honest word about safety. Fasting from food is not wise for everyone in every season. If you have a history of disordered eating, if you are pregnant or nursing, if you manage diabetes or another condition affected by blood sugar, or if you take medication that requires food — consult a doctor before fasting from food, and do not treat this page as medical advice. The God who invites you to fast also made your body, and he is not honored by recklessness with it. A partial fast (certain foods, certain hours) or a non-food fast (media, entertainment, a particular comfort) is a real fast for many believers and loses none of the spiritual purpose. The principle transfers: the voluntary laying down of a legitimate appetite to make space for God.
Third, pair the fast with prayer. This is non-negotiable. Fasting without prayer is just going hungry. Use the time and the appetite you would have spent on a meal to pray — for direction, for a loved one, for breakthrough, for your own heart. Let the hunger be a prompt. Every time your stomach reminds you that you are fasting, let it remind you why: you are hungry for something more than food. Many believers keep a specific list or request for the duration of the fast, so that the hunger is transposed into intercession. That is fasting as the body praying, and it is one of the most powerful forms of prayer the Bible knows.
Finally, break the fast gently and gratefully. End with a simple meal, with thanks. Notice how vividly food tastes when you have gone without it — that is a small parable of what God intends for all of his gifts. The fast is not about despising the body or its needs. It is about resetting the heart so that when the fast is over, you receive the daily bread you had been taking for granted as the gift it always was. Fasting trains the eye to see grace. The first bite after a fast is a sermon.
The key passages
Four verses to read in full
Each one is worth slowing down for. Read them in a public-domain translation, then open the note underneath.
“Moreover when you fast, don't be like the hypocrites, with sad faces. For they disfigure their faces, that they may be seen by men to be fasting. Most certainly I tell you, they have received their reward. But you, when you fast, anoint your head, and wash your face, so that you are not seen by men to be fasting, but by your Father who is in secret, who is in secret; and your Father, who sees in secret, will reward you.”
Matthew 6:16-18 (WEB)
The founding text on how (and how not) to fast. Jesus assumes his disciples will fast — when, not if — and then spends his energy warning against the fast that performs for an audience. The fast God honors is hidden. Look like yourself, go about your day, and let the appetite be a private conversation between you and the Father who is in secret.
““Isn't this the fast that I have chosen: to loose the bonds of wickedness, to undo the bands of the yoke, and to let the oppressed go free, and that you break every yoke?”
Isaiah 58:6 (WEB)
The most important verse in the Bible on what fasting is for. God's people had been fasting religiously while exploiting their workers and ignoring the poor, and God tells them plainly: that is not the fast I choose. True fasting overflows. The hunger in the body is meant to transpose into hunger for righteousness — loosened bonds, freed oppressed, fed neighbors. The fast that stays in the stomach has missed the point.
“Jesus said to them, “Can the friends of the bridegroom mourn, as long as the bridegroom is with them? But the days will come when the bridegroom will be taken away from them, and then will they fast.””
Matthew 9:15 (WEB)
Why Christians fast at all. Jesus is the bridegroom, and his presence was a feast the disciples did not fast through. But he would be taken from them — and the age between his ascension and his return is an age of ache. Fasting is the language of that longing. Every fast is a small prayer: Come, Lord Jesus. The appetite we set aside says our deepest appetite is for him.
“As they served the Lord and fasted, the Holy Spirit said, “Separate for me Barnabas and Saul for the work which I have called them to.” Then, having fasted and prayed and laid hands on them, they sent them away.”
Acts 13:2-3 (WEB)
The early church's pattern. At decision points that mattered — launching the Gentile mission, appointing elders — they fasted and prayed before moving. Not as a rule but as a readiness. Fasting was part of how they listened. It expressed the seriousness of their request and sharpened their spiritual hearing. The channel was already open when direction was needed.
From reading to doing
How to begin fasting
Four moves for starting a thoughtful, biblical practice. Small enough to try this week, durable enough to grow for a lifetime.
- 1
Pick the why
Never fast without a reason, and let the reason be God-ward. Direction for a decision. Breakthrough in a hard situation. Repentance. Hunger for more of God. Intercession for a loved one. Write the reason down before you begin, so that every pang of hunger has somewhere to go. A fast without a focus is just going hungry.
- 2
Start small
Begin with one meal, or a partial fast, or a non-food fast. The muscle of fasting grows with use, and there is no prize for starting with a forty-day ordeal. Skip lunch and spend the hour praying. Fast from media for a day. The principle transfers — the voluntary laying aside of a legitimate appetite to make room for God. Build the habit before you build the duration.
- 3
Keep it hidden
Jesus's instruction is to anoint your head and wash your face. Look like yourself. Do not announce it, do not mope, do not fish for people to notice. The fast is between you and the Father who is in secret. The only exception is a shared fast with a community or a spouse who is fasting with you, and even then the posture is low and glad, not theatrical.
- 4
Pray through it
Pair every fast with prayer, or it is only a diet. Use the time you would have spent eating to pray. Use the hunger itself as a prompt — every pang is a reminder of why you are fasting. Let the appetite in the body be transposed into appetite for God, for his will, for the thing you are seeking. Break the fast gently, with thanks, and let the first bite be a sermon on grace.
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Questions people ask
What the Bible says about fasting, answered
What does the Bible say about fasting?+
The Bible presents fasting as the voluntary laying aside of a legitimate appetite (usually food) for a set time, in order to seek God more deliberately through prayer. Jesus assumed his disciples would fast (Matthew 6:16, "when you fast"), and the early church fasted at key decision points (Acts 13:2-3). Isaiah 58 defines the fast God chooses as one that overflows into justice and mercy. Fasting is not about earning God's favor or punishing the body; it is the body praying, a physical declaration that we are hungry for God more than for our next meal.
Should Christians fast today?+
Yes. Jesus said his disciples would fast in the age after his ascension (Matthew 9:15), and the early church practiced it (Acts 13:2-3). Fasting is not commanded on a fixed schedule in the New Testament, but it is assumed as a normal practice. The question is not whether Christians should fast but how to recover it thoughtfully. Start small, pair it with prayer, keep it hidden, and let it be an expression of hunger for God rather than a religious performance.
What is the purpose of fasting?+
The biblical purpose of fasting is to express and deepen hunger for God. It is paired with prayer at decision points (Acts 13), with repentance (Joel 2:12), with seeking God's direction, and with intercession for others. Isaiah 58 adds that true fasting overflows into justice, mercy, and generosity. Fasting is not a hunger strike to manipulate God; it is the body joining the prayer of the heart, declaring that there is something (or Someone) we want more than we want our daily bread.
How did Jesus fast?+
Jesus fasted for forty days in the wilderness before the start of his public ministry (Matthew 4:1-2), during which he was tempted by the devil. He taught his disciples how to fast (Matthew 6:16-18) and said they would fast after he was taken from them (Matthew 9:15). His fasting was marked by dependence on the Father and on the word of God — his response to temptation was that man shall not live by bread alone, but by every word that proceeds from God's mouth.
What is the difference between fasting and dieting?+
The difference is the aim. Dieting is about the body — weight, health, appearance. Fasting is about God. A diet subtracts food to improve the body; a fast subtracts food to make room for prayer. You can diet without God and achieve your goal. You cannot fast without God and have it mean anything — the hunger has nowhere to go. If your fast is secretly about the scale, it is a diet wearing religious clothing. Be honest about which one you are doing.
What is the fast that God chooses in Isaiah 58?+
Isaiah 58:6 says the fast God chooses is to loose the bonds of wickedness, undo the bands of the yoke, let the oppressed go free, feed the hungry, shelter the homeless, and clothe the naked. The point is not that fasting is replaced by social action, but that true fasting overflows. If your fasting does not make you more tender toward the poor, more honest in your dealings, and more generous with what you have, it is the fast God rejects, no matter how devout it looks. The fast God chooses begins in the stomach and ends in the street.
How long should a Christian fast?+
The Bible does not prescribe a fixed length. Fasts in Scripture range from a single meal or part of a day (which Jesus's teaching in Matthew 6 implies) to three days (Esther), seven days (David), twenty-one days (Daniel), and forty days (Jesus, Moses). Start small — one meal or a day — and build over time. The aim is not maximum suffering but meaningful seeking. A short fast prayed through with focus honors God more than a long fast done in pride.
Is it safe to fast from food?+
For most healthy adults, short fasts are safe. But fasting from food is not wise for everyone in every season. If you have a history of disordered eating, are pregnant or nursing, manage diabetes or another condition affected by blood sugar, or take medication that requires food, consult a doctor before a food fast. God made your body and is not honored by recklessness with it. A partial fast or a non-food fast (media, entertainment, a comfort) is a real fast and loses none of the spiritual purpose.
Can I fast from things other than food?+
Yes. While food is the biblical default, the principle of fasting is the voluntary laying aside of any legitimate appetite to make room for God. Many believers fast from media, social media, entertainment, a particular comfort, or a habit for a set time, redirecting that time and attention to prayer. Daniel fasted from choice foods for three weeks. The transfer is valid: whatever appetite you lay aside, let it become a prompt to seek God. The heart of fasting is the making of space, not the specific thing given up.
How do I start fasting?+
Begin with a clear reason — direction, repentance, intercession, hunger for God — and write it down. Choose a short, manageable fast: skip one meal and spend the time praying, or fast from a specific comfort for a day. Keep it hidden (Matthew 6:16-18), pair it with prayer at every pang, and break it gently with thanks. Build the habit before you build the duration. The four-step guide on this page walks through each move, and the prayer box below lets you bring the specific thing you are seeking to God.
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