Short answer: In Matthew 6:16–18 Jesus says, "Moreover when you fast," which treats fasting as something his followers will do, not something he must command from scratch. His concern is direction: fasting performed with a sad, disfigured face to be noticed by people has already received its full reward in that attention. The disciple is instead to anoint the head and wash the face, so the fast is seen by the Father who sees in secret. Spiritual growth in fasting, then, comes from aiming it at God rather than displaying it.
Fasting in secret: the setting of Matthew 6:16-18
Matthew 6:16–18 sits inside the Sermon on the Mount, Jesus' extended teaching to his disciples about life under God's rule. This is instruction, not story. Jesus addresses a practice his hearers already kept and corrects the way it was done. The shape is a repeated contrast: he names a wrong motive and its reward, then a right practice and its reward from the Father. The same pattern appears in the surrounding verses on giving and prayer, so fasting is one panel in a series, not an isolated rule. Nothing here sets a schedule, a duration or a required frequency.
Placement matters. Verses 14 and 15 just before deal with forgiving others, which shows the chapter strings together connected practices of the devout life. Verses 16 through 18 stand between teaching on prayer, including the Lord's Prayer, and teaching on treasure in 6:19–20. The warning against performing for people flows straight into the warning against laying up treasures on earth, since both ask where the heart seeks its reward. The setting is first-century Jewish piety, where fasting, almsgiving and prayer were recognized marks of devotion. Jesus is not introducing a new practice but purifying an old one.
The Sermon addresses disciples, and its commands describe the character of life under God's rule rather than a technique for earning favor. That frame guards the passage. Fasting can quietly become a source of pride, and it can be harmful for those with medical or eating-related struggles, so it belongs in freedom, humility and wise pastoral and medical counsel, never as a lever on God's acceptance. Grace comes first: the Father who sees in secret is already Father before any practice begins. Our response is honesty about motive, not performance.
The unit ends by turning the same logic toward treasure in 6:19–20, where moth and rust consume and thieves break in. Read together, fasting and money raise one question: who is watching, and whose reward do you want? Jesus assumes the practice will continue. He simply moves its audience from the street to the secret place, where the Father sees and rewards.
Fasting that the Father sees in secret
Jesus begins with the word "when," not "if." Fasting is assumed to be part of a disciple's life, the same way giving and prayer were assumed earlier in the chapter. The issue is not whether a person fasts but how and for whom. The hypocrites Jesus describes are not people who fast too little; they are people whose religious practice is aimed at an audience. They arrange their faces to advertise their hunger, and Jesus says they have their reward already. The attention they wanted is the whole payment. Nothing further is owed them, because nothing further was sought.
Then comes a surprisingly ordinary command. Anoint your head, wash your face. In that culture these were everyday grooming habits, the opposite of a dramatic display. Jesus is not asking for deception; he is telling his disciples to look normal, to keep their fasting between themselves and God rather than turning it into a public signal. The contrast is with disfigurement, with making the face look miserable on purpose. Fasting is real before God without being visible to anyone else. The Father, Jesus says, sees in secret, and that hidden knowledge is the audience that matters.
The reward is left unnamed. Jesus does not specify what the Father will give, only that he will give it. That vagueness is deliberate. Fasting does not purchase a particular outcome, and it is never a way to earn God's favor; grace comes first, and our practice responds to it. Because fasting can quietly become pride, or become harmful for those with medical or eating-related struggles, it belongs in freedom, humility and wise counsel. The point of the passage stays fixed: fast for the Father who sees, not for the room that watches.
The reward is left unnamed. Jesus does not specify what the Father will give, only that he will give it. That vagueness is deliberate. Fasting does not purchase a particular outcome, and it is never a way to earn God's favor; grace comes first, and our practice responds to it. Because fasting can quietly become pride, or become harmful for those with medical or eating-related struggles, it belongs in freedom, humility and wise counsel. The point of the passage stays fixed: fast for the Father who sees, not for the room that watches.
Fasting seen by the Father, not by people
Jesus does not argue for fasting here; he assumes it. Verse 16 begins with “Moreover when you fast,” the same way he speaks of giving and prayer earlier in the chapter. In first-century Jewish devotion, fasting was a recognized mark of piety, so Jesus is not inventing a new practice but purifying an old one. His concern is direction: the hypocrites disfigure their faces so that others will notice. He tells his disciples instead to anoint the head and wash the face, ordinary grooming that hides the practice rather than advertising it. The question is not whether you fast but for whom.
The placement matters. Verses 14 and 15 just before this deal with forgiving others, and the Lord's Prayer comes earlier still, so the chapter reads as connected practices of a devout life rather than isolated rules. Immediately after verse 18, Jesus warns against laying up treasures on earth, where moth and rust consume and thieves break in. The two warnings share one logic: performing for people and hoarding for yourself both seek a reward in the wrong place. Fasting aimed at an audience has already been paid in full by that audience. Nothing in this context sets a schedule, a duration or a required frequency.
What the passage claims is that the Father sees in secret and will reward what is hidden. That is the whole point of the practice, not human recognition. This is description of life under God's rule, not a technique for earning favor; grace comes first, and fasting is a response, never a lever. Because fasting can feed pride or harm those with medical or eating-related struggles, it should be undertaken freely and humbly, with wise pastoral and medical counsel. Growth comes from directing the practice to God, who sees, rather than from making it visible.
When you fast: hidden devotion and honest disagreement
Jesus begins with a word that assumes something: when you fast, not if you happen to. He then sets the practice against the hypocrites who disfigure their faces so others will notice. The contrast is not between fasting and not fasting but between fasting for an audience and fasting for the Father. He tells the disciple to anoint the head and wash the face, ordinary grooming that hides the discipline rather than advertising it. The reward language in 6:18 stays general: the Father who sees in secret will reward you. What that reward is, the passage never says.
Careful readers part ways here. Some argue that when you fast carries the weight of an expected practice the church continues; others answer that Jesus assumes a custom without commanding it, and both sides can point to the fact that no explicit command appears in these verses. A related disagreement concerns whether fasting is expected of every believer or is a wisdom practice taken up freely as circumstances allow. Some read the paragraph mainly as a warning about motive; others hear a positive instruction in a discipline. The text itself defines neither the reward nor the obligation.
What holds across those readings is direction and secrecy. Fasting is aimed at the Father, not at a human audience, and it is never a lever for manipulating God or a badge for displaying superiority. That rules out treating fasting as a way to earn favor; grace precedes any discipline we take up. Because fasting can feed pride or harm a body already struggling, it belongs in freedom, humility and honest counsel, medical and pastoral, rather than pressure. The hiddenness Jesus asks for protects both the practice and the person.
Fasting for the Father who sees in secret
Jesus has just taught his disciples to pray, and he moves straight to fasting as a normal practice: "Moreover when you fast" assumes they will. His concern is not whether they fast but whom they are performing for. The hypocrites disfigure their faces so people will notice. Jesus says they have their reward already, paid in full by the audience they wanted. His alternative is oddly ordinary: wash your face, anoint your head, look like yourself. Fasting is directed toward the Father, not toward a watching crowd. The point is not hiding the practice from God but refusing to turn it into a public transaction.
The ground of reward here is relationship, not performance. Jesus names the Father twice as the one who sees in secret, and he treats that hidden seeing as enough. This is where the passage connects to Christ. He fasted in the wilderness and refused to turn it into a sign for spectators, and he taught a Father who is near to his children rather than distant and needing to be persuaded. The gospel does not make fasting unnecessary. It makes fasting safe, because acceptance before God rests on Christ and not on the discipline itself. The Father's approval is a gift, not a wage.
That changes how we approach fasting. It can quietly become a source of pride, a private scoreboard, or a way to pressure God into favor he has already given in Christ. For some, restriction is genuinely harmful, and fasting should never be undertaken without wise pastoral and medical counsel. Jesus does not command a schedule here. He frees us from needing an audience and from needing to earn anything, then invites us to seek the Father who sees. Done freely and humbly, fasting becomes a small, hidden act of trust rather than a performance.
Fasting that only your Father sees
Jesus pictures a man with a disfigured face, deliberately letting his appearance announce that he is fasting. The problem is not the fast but the audience. The same paragraph names the remedy in ordinary, almost invisible terms: wash your face, anoint your head, look like any other day. In a culture where fasting was a public marker, that instruction quietly removes the marker. Hiddenness is not an extra rule added to fasting; here it is part of the fast itself. Before you begin, ask honestly whether you want God or a watching crowd, and treat the answer as information for repentance rather than grounds for despair.
Because the Father sees in secret, you can fast without telling anyone. That also means you can stop fasting if the practice becomes a platform for self-congratulation. Notice what the text does not promise. It does not say the fast produces a particular result on your timetable; it says the Father sees, and it leaves the reward to him. Fasting is not a lever that guarantees a spiritual outcome. If you carry medical or eating-related struggles, this discipline should be undertaken freely and humbly, with wise pastoral and medical counsel, never as a way to earn God's favor.
Grace comes first and sets the ground of the discipline. You fast as a child already seen and loved, not in order to become one. Matthew 6:18 says, “so that you are not seen by men to be fasting, but by your Father who is in secret, and your Father, who sees in secret, will reward you.” That is the whole shape of faithful response: an ordinary-looking day, a practice kept between you and the Father, and the outcome left in his hands. The hiddenness is not a technique for getting more from God. It is simply what life looks like when his attention is enough.
Biblical fidelity check
Matthew 6:16–18 sits inside the Sermon on the Mount, where Jesus has already addressed giving and prayer with the same pattern: a public religious act, a warning about performing for an audience, and a promise from the Father who sees what is hidden. Reading this passage carefully means resisting two mistakes. One is lifting "when you fast" out as a standalone law, ignoring that Jesus is correcting how a practice is done, not debating whether it exists. The other is treating the reward language as a formula that guarantees a specific outcome. The text names no amount, no timing and no measurable return.
The real disagreement worth naming is whether "when you fast" lays a continuing obligation on the church or simply assumes a practice Jesus neither commands nor abolishes, and honest readers land on both sides because no explicit command appears here. Readers also differ on whether "will reward you" means a distinct reward for hidden obedience or the Father's ordinary favor on his child; the text does not define it. What stays central is that fasting is directed to the Father, hidden from human display, and never a lever for manipulating God or proving superiority.
Where Matthew 6:16-18 connects to the rest of Scripture
For further study, compare this passage with Jesus Denounces Hypocrisy in Matthew 23 on giving, Matthew 1: Genealogy and Birth of Jesus on prayer, Matthew 10: Jesus Sends the Twelve with Authority on treasure, and Matthew 12: Lord of the Sabbath and Sign of Jonah on the reward of hidden things.
Frequently asked questions
Does Jesus command Christians to fast, or does he only assume some will?
Jesus assumes his disciples will fast rather than issuing a fresh command in this passage. The wording is "when you fast," set alongside his teaching on giving and prayer, which are likewise treated as expected practices rather than optional extras. He spends no time arguing that fasting should happen; he goes straight to how it should be done and for whom. That said, the passage gives no frequency, no required length and no rule about food, so it describes a practice and directs its motive rather than legislating a schedule. Fasting is best received as a voluntary discipline that fits the life of a disciple, not as a test of belonging, and it should be undertaken freely, humbly and with wise pastoral and medical counsel.
What does it mean that the Father who sees in secret will reward you?
It means the fast is not wasted when no one else knows about it, because the Father sees what is hidden. Jesus contrasts two audiences: people, who can only see a face and a performance, and the Father, who sees the secret place where the motive lives. The reward is described as coming from the Father, not as a payment earned by the hunger or the discomfort, and the passage does not specify what the reward is or promise health, money or emotional relief. What it does establish is that hidden faithfulness is genuinely observed by God, and that his seeing is enough. This keeps fasting from becoming a transaction and keeps the disciple's confidence resting on grace rather than on output.
How do I fast without other people noticing?
Jesus gives a concrete picture: anoint your head and wash your face, the ordinary grooming of the day, so that nothing about your appearance announces the fast. The point is not deception but the removal of signals, since a deliberately sad or disfigured face was the very thing he warned against. Practically, that means keeping normal routines, not turning down meals in a way that invites questions, and not working the fast into conversation. It also means examining the quieter ways we seek an audience, such as mentioning how hard the day has been. Fasting this way should be undertaken freely and humbly, and anyone with medical or eating-related struggles should speak with a doctor and a pastor rather than pushing through alone.
