Deuteronomy 23:19-20

KJ2000(i) 19 You shall not charge interest to your brother; interest on money, interest on food, interest on anything that is lent for interest: 20 Unto a stranger you may lend for interest; but unto your brother you shall not lend for interest: that the LORD your God may bless you in all that you set your hand to in the land where you go to possess it.