Deuteronomy 23:19-24
English Standard Version
Chapter 23
19"You shall not charge interest on loans to your brother, interest on money, interest on food, interest on anything that is lent for interest. 20You may charge a foreigner interest, but you may not charge your brother interest, that the Lord your God may bless you in all that you undertake in the land that you are entering to take possession of it.
21"If you make a vow to the Lord your God, you shall not delay fulfilling it, for the Lord your God will surely require it of you, and you will be guilty of sin.
22But if you refrain from vowing, you will not be guilty of sin.
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.
