Deuteronomy 24:17-19

17Thou shalt not pervert the judgment of the stranger, nor of the fatherless; nor take a widow’s raiment for a pledge: 18But thou shalt remember that thou wast a slave in Egypt, and the LORD thy God redeemed thee from there: therefore I command thee to do this thing. 19When thou cuttest down thy harvest in thy field, and hast forgot a sheaf in the field, thou shalt not go again to fetch it: it shall be for the stranger, for the fatherless, and for the widow: that the LORD thy God may bless thee in all the work of thy hands.