Deuteronomy 24:19-21

24:19 When thou cuttest down thine 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 thine hands. 24:20 When thou beatest thine olive tree, thou shalt not go over the boughs again: it shall be for the stranger, for the fatherless, and for the widow. 24:21 When thou gatherest the grapes of thy vineyard, thou shalt not glean [it] afterward: it shall be for the stranger, for the fatherless, and for the widow.