Exodus 22:21-25

Thou shalt neither vex a stranger, nor oppress him: for ye were strangers in the land of Egypt. Ye shall not afflict any widow, or fatherless child. If thou afflict them in any wise, 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 that is poor by thee, thou shalt not be to him as an usurer, neither shalt thou lay upon him usury.