Again, ye have heard that it hath been said by them of old time, Thou shalt not forswear thyself, but shalt perform unto the Lord thine oaths:
Jesus is quoting a well-known teaching from the Old Testament — the command to keep oaths made to God (found in books like Numbers and Deuteronomy). An oath was a solemn, binding promise, often made by invoking God's name to signal total seriousness. Jesus is addressing a Jewish audience who grew up with this law. He's not criticizing the law itself, but setting the stage for something deeper: a life so honest that formal oath-swearing becomes unnecessary. This verse is the opening of a section in Jesus's famous Sermon on the Mount, where he repeatedly takes an existing law and pushes his followers further than the letter of it.
God, you know that my words don't always match my intentions. Teach me to speak plainly and honestly — to make promises I intend to keep and to keep the ones I make. Help me build a life where my word alone is enough. Amen.
Think about the last time you added 'I swear' or 'I promise' or 'honestly' to a sentence — and ask yourself why. Was it because you needed to prop up words that wouldn't quite stand on their own? Over centuries of religious life, the people Jesus was speaking to had developed an entire art form around oath-taking. Swear by heaven, swear by Jerusalem, swear by your own head — but leave God's name out of it, and you've got a little wiggle room. Jesus sees through the whole system instantly. He honors the old law before dismantling the loophole culture that had grown up around it. Here's where this quietly lands on you: how much of your communication is performance rather than plain truth? Not lying, exactly — just the subtle habit of dressing up your words with extra assurances because you're not confident they'd be believed otherwise. Jesus is building toward something radical in the verses that follow — the idea that your everyday yes should simply mean yes. That's not achieved overnight. But it starts in small moments, in ordinary Tuesday conversations, when you say what you mean and mean what you say without needing anything extra to hold it up.
What does it tell us about God's character that he takes oaths and promises this seriously — seriously enough for Jesus to address them directly?
Think of a promise you've made recently — to God, to someone else, or to yourself. How intentional were you when you made it, and how are you doing at keeping it?
Why do you think humans feel the need to swear or invoke something bigger to make their words believable? What does that habit reveal about our default level of trust in each other?
How does a pattern of small broken promises — even low-stakes ones — gradually shape your relationships and others' trust in you?
What's one area of your life this week where you could practice letting your yes simply mean yes, without the performance of extra assurances?
If a man vow a vow unto the LORD, or swear an oath to bind his soul with a bond; he shall not break his word, he shall do according to all that proceedeth out of his mouth.
Numbers 30:2
But above all things, my brethren, swear not, neither by heaven, neither by the earth, neither by any other oath: but let your yea be yea; and your nay, nay; lest ye fall into condemnation.
James 5:12
Thou shalt not take the name of the LORD thy God in vain; for the LORD will not hold him guiltless that taketh his name in vain.
Exodus 20:7
Ye have heard that it was said by them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment:
Matthew 5:21
When thou vowest a vow unto God, defer not to pay it; for he hath no pleasure in fools: pay that which thou hast vowed.
Ecclesiastes 5:4
In whose eyes a vile person is contemned; but he honoureth them that fear the LORD. He that sweareth to his own hurt, and changeth not.
Psalms 15:4
For whoremongers, for them that defile themselves with mankind, for menstealers, for liars, for perjured persons, and if there be any other thing that is contrary to sound doctrine;
1 Timothy 1:10
It is a snare to the man who devoureth that which is holy, and after vows to make enquiry.
Proverbs 20:25
"Again, you have heard that it was said to the men of old, 'You shall not make false vows, but you shall fulfill your vows to the Lord [as a religious duty].'
AMP
“Again you have heard that it was said to those of old, ‘You shall not swear falsely, but shall perform to the Lord what you have sworn.’
ESV
'Again, you have heard that the ancients were told, 'YOU SHALL NOT MAKE FALSE VOWS, BUT SHALL FULFILL YOUR VOWS TO THE LORD.'
NASB
Oaths “Again, you have heard that it was said to the people long ago, ‘Do not break your oath, but keep the oaths you have made to the Lord.’
NIV
“Again you have heard that it was said to those of old, ‘You shall not swear falsely, but shall perform your oaths to the Lord.’
NKJV
“You have also heard that our ancestors were told, ‘You must not break your vows; you must carry out the vows you make to the LORD.’
NLT
"And don't say anything you don't mean. This counsel is embedded deep in our traditions.
MSG