Leviticus 19:12

12 aYou shall not swear by my name falsely, and so bprofane the name of your God: I am the Lord.

Numbers 30:2

2 cIf a man vows a vow to the Lord, or dswears an oath to bind himself by a pledge, he shall not break his word. eHe shall do according to all that proceeds out of his mouth.

Deuteronomy 23:23

23You shall be careful to do what has passed your lips, for you have voluntarily vowed to the Lord your God what you have promised with your mouth.

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