Again, you have heard that it was said to the ancients, 'Do not break your oath, but fulfill your vows to the Lord.'

Leviticus 19:12
You must not swear falsely by My name and so profane the name of your God. I am the LORD.

Numbers 30:2
If a man makes a vow to the LORD or swears an oath to obligate himself by a pledge, he must not break his word; he must do everything he has promised.

Deuteronomy 5:11
You shall not take the name of the LORD your God in vain, for the LORD will not leave anyone unpunished who takes His name in vain.

Deuteronomy 6:13
Fear the LORD your God, serve Him only, and take your oaths in His name.

Deuteronomy 23:21
If you make a vow to the LORD your God, do not be slow to keep it, because He will surely require it of you, and you will be guilty of sin.

Deuteronomy 23:23
Be careful to follow through on what comes from your lips, because you have freely vowed to the LORD your God with your own mouth.

Matthew 5:21
You have heard that it was said to the ancients, 'Do not murder' and 'Anyone who murders will be subject to judgment.'

Matthew 5:27
You have heard that it was said, 'Do not commit adultery.'

Matthew 23:16
Woe to you, blind guides! You say, 'If anyone swears by the temple, it means nothing; but if anyone swears by the gold of the temple, he is bound by his oath.'

1 Timothy 1:10
for the sexually immoral, for homosexuals, for slave traders and liars and perjurers, and for anyone else who is averse to sound teaching

Again, you have heard that it has been said by them of old time, You shall not forswear yourself, but shall perform to the Lord your oaths: