Deuteronomy 24:17-19

17“You shall not pervert the justice due a stranger or an orphan, nor seize (impound) a widow’s garment as security [for a loan].

18But you shall remember that you were a slave in Egypt, and the Lord your God redeemed you from there; therefore I am commanding you to do this thing.

19“When you reap your harvest in your field and have forgotten a sheaf [of grain] in the field, you shall not go back to get it; it shall be for the stranger, for the orphan, and for the widow, so that the Lord your God may bless you in all the work of your hands.