Bible Verses About Swearing Falsely: Forbidden

Do not swear by my name falsely, which would be profaning the name of your God; I am ADONAI.

when a man makes a vow to ADONAI or formally obligates himself by swearing an oath, he is not to break his word but is to do everything he said he would do.

"Again, you have heard that our fathers were told, `Do not break your oath,' and `Keep your vows to ADONAI.'