Deuteronomy 23:19-23

The Message

^19-20 Don’t charge interest to your kinsmen on any loan: not for money or food or clothing or anything else that could earn interest. You may charge foreigners interest, but you may not charge your brothers interest; that way God, your God, will bless all the work that you take up and the land that you are entering to possess.

^21-23 When you make a vow to God, your God, don’t put off keeping it; God, your God, expects you to keep it and if you don’t you’re guilty. But if you don’t make a vow in the first place, there’s no sin. If you say you’re going to do something, do it. Keep the vow you willingly vowed to God, your God. You promised it, so do it.