Bible Verses About Swearing Falsely: Forbidden

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

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.

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