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Matthew 5:33-37 · BSB

Matthew 5:33-37 — Oaths & Honesty

By Dig Deeper EditorialReviewed by Andy7 min readUpdated

Matthew 5:33-37: An oath is a crutch for a limping honesty.

Listen — Matthew 5:33-37
Read the transcript

LINDA: Why would saying "I swear" come from the devil? Jesus says anything beyond a plain yes or no "comes from the evil one," and my instinct runs the opposite way... swearing is what you do when you really, really mean it. Isn't it the honest person's move?

FRANK: The second "really." [laughs] That little second "really" is what Jesus is going after today, and I think by the end of this you'll hear it differently every time it comes out of your mouth. Welcome to Dig Deeper, I'm Frank Edwards.

LINDA: I'm Linda Brown, and we're in Matthew five, verses thirty-three to thirty-seven, another of the "you have heard it said" pairs from the Sermon on the Mount. Five verses about oaths, which sounds like the least urgent topic imaginable until you count how many times a day you say "I promise." Frank, read it for us?

FRANK: Matthew five, beginning at verse thirty-three. "Again, you have heard that it was said to the ancients, 'Do not break your oath, but fulfill your vows to the Lord.' But I tell you not to swear at all: either by heaven, for it is God's throne; or by the earth, for it is His footstool; or by Jerusalem, for it is the city of the great King. Nor should you swear by your head, for you cannot make a single hair white or black. Simply let your 'Yes' be 'Yes,' and your 'No,' 'No.' Anything more comes from the evil one."

LINDA: Heaven, earth, Jerusalem, my own head. Why that list? On first hearing it reads as a random inventory of things you could point at.

FRANK: Random is the one thing it isn't. It's a ladder, and to see the ladder you need the law standing underneath it. Under Moses, a vow was never a mood or a wish. Numbers thirty says that when a man vows a vow to the Lord, "he shall not break his word; he shall do according to all that proceeds out of his mouth." Deuteronomy adds that you don't even get to be slow about it, because the Lord "will surely require it of you." A vow was a debt. And God was the creditor. Now... what do people do with a debt they'd rather not pay? They go looking for the fine print. By Jesus' day the teachers were seriously debating which oaths actually held, and the answer they'd worked out was that if you swore by the name of God himself you were bound beyond question, but if you swore by heaven, or the earth, or Jerusalem, or your own head, you'd stopped just short of the name and left a door open at the back of the room.

FRANK: Jesus goes after the same game later in Matthew twenty-three, where people are ranking the temple against the gold of the temple, the altar against the gift sitting on it. A grading system for how much truth you owe. And watch how he answers it here. He doesn't argue about which rung holds. He kicks the ladder over. Heaven? God's throne. Earth? His footstool. Jerusalem? The city of the great King. Surely your own head is yours... and you can't turn one hair white or black. There's nothing left. No object anywhere in creation sits far enough from God to be sworn by safely, which means every oath, whatever you name in it, drags him in anyway.

LINDA: I'll follow you that far. People were gaming a system, Jesus shuts the loophole, good. That still feels like a stretch to me, though, from "stop gaming the system" to "the extra words come from the evil one." A mom saying "I promise" to her kid at bedtime is not doing the devil's work.

FRANK: Nobody's accusing the mom. Let's look at the actual words, because they're more careful than they sound in English. "Anything more" translates to perisson... the surplus, what spills over the brim, whatever you pile on top of what's needed. And "comes from the evil one" is ek tou ponērou, which can mean "the evil one" or simply "evil," and good translators split on it. Either way, Jesus is naming where the surplus originates. Why would anyone need extra words on top of yes? Because we live in a world where a plain yes can't be trusted, where lying is so ordinary that we've had to invent a louder voice for the times we mean it. The oath isn't the disease, Linda. It's the symptom. It tells you something's broken. And here's what the symptom quietly admits. If some of your sentences need the extra, what does that say about all the others?

LINDA: The others go on sale. If I've got a special voice for the stuff that's really true, then my ordinary voice gets permission to be a little bit false. That's a sharp point... and it still smells like semantics to me. People say "honestly" and "I swear" as filler. Nobody's running a two-tier truth system on purpose.

FRANK: On purpose, probably not. Most two-tier systems aren't built on purpose; they settle in by habit, one "I'll try to make it" at a time, until a person genuinely can't tell anymore which of their own words were load-bearing. The way Henry framed it is about as tight as anyone ever has: "The worse men are, the less they are bound by oaths; the better they are, the less there is need for them." Read that twice and you notice he isn't really talking about oaths at all. He's talking about the gap. The more honest you become, the smaller the distance between your sworn word and your plain one, until finally there's no distance and the oath has nothing left to add.

LINDA: Then press it all the way. Jesus says "not at all." If "not at all" means not at all, then every believer who's put a hand on a Bible in a courtroom, or signed a mortgage, or stood at the front of a church and said "I do"... they're disobeying. Are they?

FRANK: Some Christians have concluded exactly that, and they refuse every oath, and I respect them for taking the words at full strength. But much of the church has read Jesus as aimed at the habit rather than the courtroom, and the reason is inside Scripture itself. Paul calls God as his witness more than once. When the high priest puts Jesus under oath at his trial, Jesus answers. And Hebrews six says God himself swore, by himself, so that "by two immutable things, in which it is impossible for God to lie, we may have a strong encouragement." Think about why God would do that. He didn't need the oath. His word was already enough. He swore because we're weak, because we're the kind of people who need a promise underlined, and so he stooped. [short pause] The oath was for the listener. It always was.

LINDA: God stooping is what gets me. He swears because we're the ones who can't just take his word. I'll give you the courtroom and the wedding. What I won't give you is that any of this is simple, because if my plain yes is supposed to be as good as a sworn one, then most of my yeses are in trouble.

FRANK: Most of them are. Mine too. Which is why this can't finally be a technique for tidier speech, and the passage doesn't treat it as one. Go to the first page of the Bible. "God said, 'Let there be light,' and there was light." Look at the space between what God says and what happens. There isn't any. He doesn't guarantee, he doesn't promise, he doesn't add a single word of surplus... he speaks, and it stands. Theologians call this the veracity of God, his truthfulness, and it's woven into what it means that we're made in his image. Even Balaam, a prophet hired to curse Israel, blurts out the truth: "God is not a man, that he should lie... Has he said, and will he not do it?" That leads somewhere. The command isn't "be careful with your words." It's "speak the way your Father speaks."

FRANK: And it goes further than Genesis. In Second Corinthians, Paul has been accused of double-talk... he said he'd visit, his plans changed, and his critics sneered that he says yes and no in the same breath. Paul doesn't just defend his own reliability. He points at Christ: "however many are the promises of God, in him is the 'Yes.'" Each promise God made—to Abraham, to David, to a scattered people through the prophets—hung open for centuries, waiting, and in Jesus all of them were answered. He didn't just speak God's yes. He is God's yes. Which means the one telling you "let your yes be yes" in Matthew five is the only person who has ever lived that sentence without a gap.

LINDA: Waiting. That word stops me. A biopsy result that isn't back yet, a prayer prayed for years that hasn't moved an inch—hearing "in him is the yes" while your answer is still "not yet" lands differently. Does God's yes mean the result comes back clean?

FRANK: No, and I don't want to pretend it does, because that would make me a liar about a passage on lying. Paul says the promises of God find their yes in Christ... the promises. Not all requests we bring. What God has actually pledged in the gospel is that he will not leave you, that your sins are forgiven down to the marrow, that death does not get the last word over anyone who belongs to Jesus. Those have no "we'll see" attached. The test can come back hard and they all still stand. So the person waiting isn't waiting on whether God will keep his word. They're waiting inside a word he's already kept.

LINDA: The waiting runs the other direction too, and that's where this gets uncomfortable. You have someone waiting on you right now. The friend who asked if you'll help with the move. The person who asked you to be a reference. The volunteer coordinator whose email you've let sit with "let me pray about it" because you don't want to say no, and you don't want to say yes either, so you say neither, and they're stuck in a waiting room you built for them.

FRANK: "Let me pray about it," when you already know. That's perisson in its most respectable clothes. It sounds devout. What it does is keep a back door open, the same back door as swearing by heaven instead of by God... you get to look faithful while keeping your escape route. Jesus' plain "no" turns out to be the kinder word, because a clean no releases the person, and a fuzzy maybe keeps them sitting by the door. And the same goes for the old yeses that never became true. The money you said you'd pay back. The apology you promised and hoped everyone would forget. The follower of a truthful Lord can't keep a drawer full of dead promises and call it peace.

LINDA: What it costs is ten seconds of being the person who disappoints somebody. Saying "no, I can't" out loud, and then not padding it with three reasons. Saying "I told you I'd do this and I didn't" and not reaching for "I've been so busy." It costs the cushion. And the cushion is most of what I say.

FRANK: Pride doesn't give up the cushion easily. You won't do this on willpower. You do it because the Christ who is God's yes kept his word to you when it cost him the cross, and there's no clause he'll renegotiate, no promise he half-meant. He paid the debt you couldn't. Your small debts get paid standing on that one. Paul says through him our "Amen" rises back to God... which is just a Hebrew way of saying "so be it, it stands." Your plain word becomes a small amen, echoing his.

LINDA: His yes comes first. Then mine gets to be small, and plain, and enough.

FRANK: Matthew five, verse thirty-seven. [short pause] "Simply let your 'Yes' be 'Yes,' and your 'No,' 'No.'" Spoken by someone who never needed more.

LINDA: Dig Deeper is an app, by the way, and if you're new here you can find it in your app store on iOS or Android.

Matthew 5:33-37 · BSB

“Again, you have heard that it was said to the ancients, ‘Do not break your oath, but fulfill your to the Lord.’ But I tell you not to at all: either by , for it is God’s ; or by the earth, for it is His ; or by , for it is the city of the great King. Nor should you swear by your head, for you cannot make a single hair white or black. Simply let your ‘’ be ‘Yes,’ and your ‘No,’ ‘No.’ Anything more comes from the one.”

Tap an underlined word to see the original Greek. Or read all 9 written out.

Scripture: Berean Standard Bible (BSB), public domain.

Reflect

Jesus reaches past the rulebook about which oaths are binding and asks a deeper question: why should a truthful person ever need to swear at all? The elaborate system of vowing by heaven, earth, or the city assumed there were sacred things and neutral things, places where God was not watching. He removes that fiction entirely, showing that every corner of creation already belongs to God, so there is nowhere to stand where your word is not spoken in his hearing.

This lifts the whole weight of your integrity onto ordinary, unadorned speech. You are not called to swear harder but to become someone whose plain yes needs no reinforcement, whose no can be trusted without a guarantee. Where in your life do you reach for extra assurances, promises, and emphatic language, precisely because you suspect your bare word is not enough?

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Questions about this passage

So does this mean Christians can't take an oath in court or say wedding vows?

The point isn't a ban on ever formalizing a promise — the Old Testament permitted oaths and told people to keep their vows. Jesus is attacking the game where people used lesser oaths as escape hatches, and calling us to be so honest that our ordinary word already carries the weight.

Why does swearing by heaven or earth still count if you didn't say God's name?

Because it all belongs to him anyway. Heaven is his throne, earth is his footstool, Jerusalem is his city, and you can't even turn one hair white — so every oath drags God in whether you name him or not. There's no neutral thing left to swear by.

Wasn't the Old Testament fine with vows? Isn't Jesus contradicting it?

No — he's restoring it. The law required that vows to the Lord be kept and forbade swearing falsely by his name. The Pharisees cheapened that standard with loopholes, and Jesus deepens it by binding truth to every word, not just the sworn ones.

Did anyone else in the New Testament repeat this teaching?

Yes — James, Jesus' own brother, echoes it almost word for word: let your yes be yes and your no be no, so that you will not fall under judgment. The early church clearly heard this as a call to plain, dependable honesty in everyday speech.

Have a different question about Matthew 5:33-37? Ask it — I read every one, and the best get answered here.

A lesson to teach this devotional

For friends, small groups, and Bible classes — easy to use whether you're teaching for the first time or the fiftieth.

If you're a person who tells the truth all the time, you never need to swear you're telling the truth right now. Jesus wants your plain word to be so reliable that 'I promise' becomes pointless.

Read the full lesson →

Words in this passage

All 9 Greek words written out in full.

archaios (ἀρχαῖος)

archaios is the Greek behind “ancient” in Matthew 5:33-37. Rooted in archē, beginning or origin, this term points not merely to old people but to the founding generation, those at the source of the tradition. Jesus is invoking the ancestral chain through which the law was received, then setting his own word alongside it with startling authority.

horkos (ὅρκος)

horkos is the Greek behind “vows” in Matthew 5:33-37. A horkos was a binding oath, an appeal to something sacred to guarantee that words were true. The old rule policed which oaths counted as valid; Jesus dissolves the whole apparatus by asking why a truthful person would ever need one.

omnyō (ὀμνύω)

omnyō is the Greek behind “swear” in Matthew 5:33-37. This verb means to take an oath by naming a witness greater than oneself, calling that witness to enforce one's honesty. The infinitive here is a flat prohibition of the practice as commonly abused, not a ban on all sworn testimony, since the point is against manipulating sacred names to add weight to speech.

ouranos (οὐρανός)

ouranos is the Greek behind “heaven” in Matthew 5:33-37. The sky and the dwelling of God are one word in Greek, and that ambiguity is precisely the trap Jesus exposes. People swore by heaven imagining it a lesser guarantee than God himself; he answers that heaven belongs so wholly to God that the loophole never existed.

thronos (θρόνος)

thronos is the Greek behind “throne” in Matthew 5:33-37. A thronos is the seat of a ruler, the place from which sovereign authority is exercised. By calling heaven God's throne, Jesus insists that anything you might swear by is already saturated with God's presence, so no oath can be made that does not implicate him directly.

hypopodion (ὑποπόδιον)

hypopodion is the Greek behind “footstool” in Matthew 5:33-37. Literally the thing under the feet, drawn from Isaiah's image of the earth beneath God's resting feet. The word deliberately lowers the earth beneath the throne of heaven, yet even this humblest furniture of God still cannot serve as a neutral, God-free thing to swear by.

Hierosolyma (Ἱεροσόλυμα)

Hierosolyma is the Greek behind “Jerusalem” in Matthew 5:33-37. The name carries the sense of a holy possession, the city set apart as God's dwelling among his people. Swearing by it seems to keep God at arm's length, but Jesus names it the city of the great King, closing yet another supposed escape hatch.

nai (ναί)

nai is the Greek behind “yes” in Matthew 5:33-37. A simple particle of affirmation, the plainest possible way to agree. The doubling, let your yes be yes, calls for speech so consistent that a bare word carries the full weight an oath once had to borrow.

ponēros (πονηρός)

ponēros is the Greek behind “evil” in Matthew 5:33-37. This word describes not just badness but active, corrupting malice, and with the article it can point to the evil one himself. The verse traces the impulse to prop up our words with oaths back to a source that thrives on deception, making truthfulness a matter of allegiance.

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