Deuteronomy 23:19-20
19“aYou shall not charge interest to your brother: interest on money, food, or anything that may be loaned at interest. 20“aYou may charge interest to a foreigner, but to your brother you shall not charge interest, so that bYahweh your God may bless you in all 1that you send forth your hand to do in the land which you are about to enter to 2possess.