Matthew 5:37: what Jesus is asking for when he bans oath-taking
37But let your word ‘Yes’ mean ‘Yes,’ and ‘No’ mean ‘No.’ For anything beyond that is of evil.
The verse this page is about.
Short answer
Matthew 5:37 ends a passage on oaths by asking for something plain: a yes that holds as yes, a no that holds as no. The target is not religious language but the habit of propping up your own word — if it needs propping, the problem started earlier, in not being reliable.
- Written by
- Maria Luisa Navarro Schmitt
- Reviewed by
- Raphael Navarro Schmitt
- Published on
- Reading time
- 3 min read
Swearing, in the world of the text, was not profanity. It was a legal and social instrument: invoking something sacred to give a promise weight. There were grades of oath, and the debate of the day was about which ones actually bound you and which could be undone.
That machinery is what Jesus dismantles. In the preceding verses he closes the exits one by one, and arrives at a demand that makes the whole system unnecessary: speak in a way that needs no guarantee bolted on.
Where this verse appears
We are in the Sermon on the Mount, inside the run of contrasts where Jesus quotes a known instruction and pushes it further. This block opens with the prohibition of false swearing and of failing to deliver what was sworn.
Jesus goes past what the instruction asked. He rules out swearing by heaven, by earth, by Jerusalem and even by one’s own head, giving the same reason each time: none of it belongs to the person swearing. Today’s verse is the practical conclusion of that list.
What it says
The issue is not vocabulary but reliability. An oath exists because ordinary speech is not trusted; by asking that a plain yes be enough, Jesus is asking that the gap between solemn speech and everyday speech disappear.
A note on this edition’s closing clause, because it differs from the rendering many readers carry. Here, whatever goes beyond a simple yes or no is said to be of evil — stated impersonally, as a quality of the speech itself. Other translations name the evil one as its source. The version on this page keeps the focus on the words rather than on an agent behind them, which makes the sentence harder to deflect.
Christians differ on the reach of this. Some groups take the prohibition literally and decline every oath, including in court; most traditions distinguish a formal oath required by law from the daily habit of swearing in order to be believed. This page does not settle the question. It notes that the disagreement is old and that both sides are reading the same verse.
What to do with it today
The practical question is uncomfortable and useful: how many times a week do you reinforce a sentence with I swear, trust me, I promise? Every reinforcement is a small admission that your word on its own has not been carrying the weight.
The way back is not better phrasing. It is promising less: saying no when it is no, flagging early when something will not happen, agreeing to deadlines you can actually meet. It is months of work, and it shows up first in small things.
What the passages say
12But before all things, my brothers, do not choose to swear, neither by heaven, nor by the earth, nor in any other oath. But let your word ‘Yes’ be yes, and your word ‘No’ be no, so that you may not fall under judgment.
James repeats the instruction in almost the same terms and adds the stake: the point is not to fall under judgment. Evidence that this circulated in the communities as a practical rule rather than as hyperbole.
34But I say to you, do not swear an oath at all, neither by heaven, for it is the throne of God,
The start of the block, and the key to the logic: everything people swore by belongs to God, not to the one swearing. To swear by them is to dispose of what is not yours.
A prayer to carry with you
Lord, I have promised things I did not deliver and reinforced words I did not keep. Help me speak less and mean more. Let the people around me not need extra guarantees to believe me. Amen.