Leviticus 19:12

19:12 You must not swear falsely in my name, so that you do not profane the name of your God. I am the Lord.

Leviticus 6:3

6:3 or has found something lost and denies it and swears falsely concerning any one of the things that someone might do to sin –

Leviticus 6:5

6:5 or anything about which he swears falsely. He must restore it in full and add one fifth to it; he must give it to its owner when he is found guilty.