Short answer: In Matthew 6:16–18 Jesus speaks of fasting as something his disciples will do, not as a fresh obligation he imposes. His warning targets the hypocrites who disfigure their faces so others notice their fasting, and his instruction is to anoint the head and wash the face so the fast stays hidden. The fast is then known to the Father who sees in secret, and Jesus says that Father will reward what is hidden, leaving the timing and shape of the reward with him.
Where fasting fits in the sermon on the mount
Matthew 6:16–18 belongs to the Sermon on the Mount, Jesus' extended teaching to his disciples about life under God's rule. The passage sits in a run of three matched units on giving, praying, and fasting. Each one names a wrong audience, a right audience, and a reward from the Father. The shape is plain instruction: a command, a contrast, and a promise attached to the hidden path. Jesus assumes his hearers already fast. He says when you fast, not if, and he spends his words on motive and manner rather than on whether the practice belongs in a disciple's life.
The immediate setting matters. These verses follow the Lord's Prayer and a short word about forgiving others, so Jesus is treating familiar religious ground as his own. Fasting in Israel's Scriptures accompanied mourning, repentance, urgent petition, and national crisis. The law prescribed one annual fast day, while later practice multiplied fasts. Jesus neither abolishes the practice nor fixes its frequency, length, or kind of food. He leaves those details alone and presses on the one thing his hearers could control: whether the fast is staged for people or offered to the Father who sees in secret.
Right after this, Jesus turns to treasure, warning against storing up things on earth where moth and rust consume and thieves break in, and urging treasure in heaven instead (6:19–20). That turn is not a change of subject. It shows what the hidden fast is aiming at: a heart set on the Father's approval rather than human notice. Fasting is real bodily discipline, and it is not a contest. Anyone with a medical condition, an eating disorder, or a pregnancy should seek appropriate medical advice, and food restriction belongs to Christian freedom, never to spiritual competition.
Before any of that, grace: the Father who sees in secret is already yours in Christ, and the fast is a response to him, not a bid for his attention.
When you fast: the wording of Matthew 6:16-18
Notice the small word that opens this section: "when." Jesus does not say if you fast, as though it were an optional extra for a spiritual elite. He assumes his disciples will fast, just as he assumes they will give and pray, and he moves straight to how it should be done. The contrast he draws is not between fasting and not fasting but between two ways of fasting. The hypocrites, he says, disfigure their faces so that they may be seen by men to be fasting. The warning lands on appearance, not on hunger. Hunger is part of fasting; performing hunger for an audience is the problem. The fast itself is assumed. What Jesus targets is the theater around it.
The instruction that follows is almost comically ordinary. Anoint your head, he says, and wash your face. This is the everyday grooming a person would do before leaving the house, the normal preparation for being seen in public. Jesus is not recommending a disguise but the absence of a signal. Nothing about your appearance should announce that you are fasting. The phrase "your Father, who sees in secret" carries the weight here. The audience Jesus names is the Father, and the Father sees what no one else sees. The reward is stated without being defined, which keeps the focus on the one who gives it rather than on what we receive.
Two things follow from the wording. First, fasting is a matter of freedom before God, not a competition with other believers, so the person who fasts briefly and quietly is not behind anyone. Second, fasting involves the body, and bodies differ. If you have a medical condition, an eating disorder, or are pregnant, seek appropriate medical advice before restricting food, and treat any adjustment as obedience rather than failure. The passage never promises that fasting earns anything. It promises that the Father sees. Grace comes first: we fast as children already seen and known, not as performers hoping to be noticed.
Fasting for the Father who sees in secret
Jesus introduces fasting with the word "when," not "if." He assumes his disciples will fast, the way he assumes they will give and pray, but he issues no command about how often or how long. What he targets is the audience. The hypocrites disfigure their faces so that others will notice their fasting, and Jesus says plainly that they have received their reward. His disciples are to anoint their head and wash their face, ordinary grooming, so the fast stays hidden. The point is not that fasting is wrong but that performing it for admiration empties it of any reward from God.
These verses sit right after the Lord's Prayer and a brief word about forgiving others, which shows Jesus is treating familiar religious practice as common ground with his hearers. In the wider sermon, alms, prayer, and fasting run in sequence, and each unit follows the same shape: the wrong audience, the right audience, and the reward from the Father. In Israel's Scriptures, fasting accompanied mourning, repentance, and urgent petition, and the law set one annual fast day while later practice multiplied fasts. Jesus neither abolishes the practice nor regulates its frequency, length, or food.
Immediately after this, Jesus turns to treasure, warning against storing up things on earth where moth and rust consume and thieves break in. That turn is not a change of subject. The hidden fast and the hidden treasure belong together: both ask where the heart is looking for its reward. Jesus promises that the Father, who sees in secret, will reward what is hidden, and he leaves the timing and shape of that reward in the Father's hands. Fasting can harm people with medical conditions, eating disorders, or pregnancy, so seek appropriate medical advice and treat food restriction as a matter of freedom, not spiritual competition.
Fasting in secret: what the text says and leaves open
Jesus sets fasting beside giving and prayer as a practice his disciples will keep, and the grammar assumes it: when you fast, not if you happen to. His concern in 6:16–18 is the audience. The hypocrites disfigure their faces so others will notice their discipline, and Jesus says plainly that they have their reward already. The alternative he gives is oddly ordinary: wash your face, anoint your head, look like a normal day. The point is not that fasting must be invisible to every human being, but that it is directed to the Father who sees in secret. The reward named is the Father's, not a result we can measure.
Readers genuinely differ on how far the secrecy reaches. Some conclude fasting should never be mentioned at all; others point out that Israel had public fast days and that Jesus himself assumes communal practice elsewhere. The text itself commands no schedule, no duration, and no dietary rule, and it promises no physical or circumstantial outcome. It also does not settle whether fasting is binding on the church, a free wisdom discipline, or mainly for urgent prayer. What stays central is the direction of the act: toward the Father, hidden from self-promotion, rewarded by him alone. These are wisdom principles about motive, not unconditional promises about results.
One practical limit matters here. Fasting involves food, and food restriction can harm people with medical conditions, during pregnancy, or with a history of disordered eating. Seeking medical advice is not a lack of faith. Because the passage sets no rule, no one should turn fasting into a competition or a measure of maturity, and no one should be pressed into it. The freedom Jesus protects is freedom from performing for people. Whether you fast or abstain from fasting, the Father sees, and the reward he gives is his to define.
Fasting before the Father who sees in secret
Jesus has just taught his disciples to pray to a Father who sees in secret, and he carries that same contrast into fasting. The hypocrites in 6:16 disfigure their faces so others will notice their devotion. Jesus does not deny that fasting belongs among his people's practices; he assumes it, saying when you fast, not if. What he targets is the audience. A fast aimed at human spectators has already collected its payment. The disciple instead anoints the head and washes the face, ordinary grooming that hides the discipline, so the fasting is seen only by the Father who is in secret. The practice stays, but its direction changes entirely.
The hunger Jesus describes is not only for food. It is the appetite to be admired for our devotion, and it runs through prayer, giving and fasting alike. Jesus himself fasted in the wilderness, and when hunger pressed him he refused to turn bread into a spectacle or to test whether the Father would come through. Where Israel's fasts and ours so often curdle into performance, he obeyed in hiddenness and then went to the cross, where that pride is both exposed and forgiven. His reward is not wages we earn but the Father's gracious answer to hidden obedience, given in the Father's time and in the Father's way.
That grace frees us to treat fasting as a matter of freedom rather than spiritual competition. Scripture never commands a fixed schedule here, and wisdom differs from person to person. Fasting can harm people with medical conditions, eating disorders or pregnancy, so seek appropriate medical advice and do not measure your standing with God by what you abstain from. The Father who sees in secret is not watching for a performance. He is the Father who already knows your need, and any hidden obedience you offer is received by him, not by an audience.
Fasting for the Father who sees in secret
Start with the question Jesus puts to the heart: for whom am I fasting, and would I still do it if no one ever knew? In 6:16 he pictures people who disfigure their faces so others can tell they are fasting. Their reward is the notice they wanted. He tells his hearers instead to anoint the head and wash the face, ordinary grooming that keeps a fast from announcing itself. So choose a simple, sustainable form, whether from food or another appetite, and keep your appearance and speech unremarkable. If a fast only makes sense when someone notices, that is worth naming honestly before God.
Let the hunger or the empty space become a prompt to prayer. Jesus says the Father sees in secret, and that is where the fast is directed. When the stomach complains or the phone stays in your pocket, turn that small ache into attention toward God rather than toward your own performance. Do not measure the day by how spiritual you feel or by visible results, because 6:18 promises reward from the Father without describing what it is. Feelings rise and fall, and the text does not tie the Father's response to them. The fast is a quiet turning, not a scoreboard.
Fasting can harm people with medical conditions, eating disorders, or pregnancy, so seek appropriate medical advice and treat food restriction as a matter of freedom, not spiritual competition. Grace comes first: in Christ you are already accepted, and obedience grows from that acceptance rather than from a need to prove anything to God or to anyone watching. A skipped meal does not make you more loved, and a full one does not make you less. Keep the practice small enough to sustain and ordinary enough to stay hidden, and let it train your attention on the Father who sees.
Biblical fidelity check
Matthew 6:16–18 sits inside a longer section where Jesus addresses giving, prayer and fasting in turn, and the word "when" governs all three, assuming his disciples will practice them. Read carefully, the passage warns against disfiguring the face so others notice the fast, then directs ordinary grooming so nothing in the appearance announces it. The risk here is turning a warning about appearance into a rule about disclosure, or turning the promised reward into a guarantee of physical or circumstantial results. The text commands no schedule, duration or diet.
Evangelical readers agree that fasting for human applause is forbidden and that the Father sees what is hidden, but they differ on how far secrecy reaches. Some say fasting should never be mentioned; others note that Scripture records public fasts and that Jesus targets motive rather than any disclosure. Readers also differ on whether fasting binds the church, is a wisdom discipline undertaken freely, or belongs to urgent prayer. What stays central is that fasting is directed to the Father, hidden from self-promotion, and rewarded by him alone.
Related studies for Matthew 6:16-18
These verses sit inside the Sermon on the Mount, where Jesus also addresses giving and prayer, so reading them together shows a single concern about the audience we perform for. Comparing the wider passage with the Lord's Prayer and with teaching on treasure can deepen the practice of fasting and prayer. Jesus Denounces Hypocrisy in Matthew 23 Matthew 1: Genealogy and Birth of Jesus Matthew 10: Jesus Sends the Twelve with Authority Matthew 12: Lord of the Sabbath and Sign of Jonah.
Frequently asked questions
Should I tell anyone that I am fasting?
No, Jesus says not to fast in order to be seen by others. In 6:16 he warns against the sad-faced display of the hypocrites, who disfigure their faces so people will notice their fasting, and he says they have received their reward. Instead, 6:17–18 tells the fasting person to anoint the head and wash the face, so the fasting is not seen by men but by the Father who sees in secret. Jesus does not forbid every mention of fasting, but he rules out fasting as a performance for an audience.
Does Jesus actually command his followers to fast, or is fasting something optional for Christians?
Jesus does not present fasting as optional in Matthew 6:16–18; he says "when you fast," assuming his disciples will do it, just as he says "when you pray." He gives no command to abstain from fasting, only instruction on how to fast without display. The passage regulates motive and manner, not whether to fast at all. So fasting is expected of disciples, but the text sets no fixed schedule or frequency, and it promises reward from the Father who sees in secret.
When I set aside time to fast and pray, what should I actually do during it?
Keep the fast between you and your Father, not on display. Jesus says not to look gloomy or disfigure your face to be noticed, but to anoint your head and wash your face so your fasting stays unseen by people and seen by your Father in secret. So the ordinary routines of washing and grooming continue; the point is hiddenness, not performance. Your Father, who sees in secret, is the one you are fasting before, and he rewards what is done for him rather than for an audience.
