Deuteronomy 23:19-20 - Interest On Loans
19 You must not charge interest on a loan to your fellow Israelite, whether on money, food, or anything else that has been loaned with interest. 20 You may lend with interest to a foreigner, but not to your fellow Israelite; if you keep this command the Lord your God will bless you in all you undertake in the land you are about to enter to possess.