Exodus 22:21-25

And a sojourner shalt thou not wrong, neither shalt thou oppress him: for ye were sojourners in the land of Egypt. Ye shall not afflict any widow, or fatherless child. If thou afflict them at all, and they cry at all unto me, I will surely hear their cry; and my wrath shall wax hot, and I will kill you with the sword; and your wives shall be widows, and your children fatherless. If thou lend money to any of my people with thee that is poor, thou shalt not be to him as a creditor; neither shall ye lay upon him interest.