Deuteronomy 23:19-21 Christian Standard Bible (CSB)
Interest on Loans
19 “Do not charge your brother interest on silver, food, or anything that can earn interest. 20 You may charge a foreigner interest, but you must not charge your brother Israelite interest, so that the Lord your God may bless you in everything you do[a] in the land you are entering to possess.
21 “If you make a vow to the Lord your God, do not be slow to keep it, because he will require it of you, and it will be counted against you as sin.