Deuteronomy 23:19-21
Revised Standard Version Catholic Edition
19 “You shall not lend upon interest to your brother, interest on money, interest on victuals, interest on anything that is lent for interest. 20 To a foreigner you may lend upon interest, but to your brother you shall not lend upon interest; that the Lord your God may bless you in all that you undertake in the land which you are entering to take possession of it.
21 “When you make a vow to the Lord your God, you shall not be slack to pay it; for the Lord your God will surely require it of you, and it would be sin in you.
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