Biblion Bible Commentary
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Let Your Yes Be Yes
Matthew 5:33-37
33 “Again you have heard that it was said to the ancient ones, ‘You shall not make false vows, but shall perform to the Lord your vows,’ · WEB
The fourth: oaths are a symptom, and the cure is a person whose ordinary word does not need reinforcing.
"Again you have heard that it was said to the ancient ones, 'You shall not make false vows, but shall perform to the Lord your vows'" Matthew 5:33.
The law took oaths seriously and required that they be kept Leviticus 19:12 Numbers 30:2. What had grown up around it was a graded system: swearing by heaven, by the earth, by Jerusalem, by one's own head — formulas understood to bind more or less tightly depending on which was used. This Gospel returns to the practice later and names it outright, with teachers ruling that swearing by the temple counted for nothing while swearing by its gold was binding Matthew 23:16–22.
"But I tell you, don't swear at all: neither by heaven, for it is the throne of God; nor by the earth, for it is the footstool of his feet" Matthew 5:34–35.
The reasoning dismantles the whole scheme in three strokes. Every substitute invoked belongs to God already — heaven is his throne, earth his footstool Isaiah 66:1, Jerusalem his city — so an oath that avoids the divine name has not avoided God. There is no formula that leaves him out.
"Neither shall you swear by your head, for you can't make one hair white or black" Matthew 5:36.
And the last one is different: your own head is the one thing in the list you might think is yours to stake, and it turns out you cannot alter a hair of it. A man swearing by himself is pledging security he does not own.
"But let your 'Yes' be 'Yes' and your 'No' be 'No.' Whatever is more than these is of the evil one" Matthew 5:37.
The positive command is about the kind of person rather than the wording of a promise. Oath formulas exist because ordinary speech is not trusted, and a graded system exists because people want a way to sound binding while keeping an exit. Both are unnecessary in someone whose plain word is reliable.
Read as an absolute ban on all sworn statements, the paragraph runs into the fact that God himself swears Hebrews 6:13, Paul calls God as witness 2 Corinthians 1:23, and Jesus answers under oath at his own trial Matthew 26:63–64. What is forbidden is the practice being described — reinforcing one's own speech with escalating guarantees — rather than a legal formality required by a court.
held with reason What this mark means