Deuteronomy 24:19 in the King James Version
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.
Context
18 but you shall remember that you were a slave in Egypt, and the LORD your God redeemed you there. Therefore I command you to do this thing.
19 When you reap your harvest in your field, and have forgotten a sheaf in the field, you shall not go again to get it. It shall be for the foreigner, for the fatherless, and for the widow, that the LORD your God may bless you in all the work of your hands.
20 When you beat your olive tree, you shall not go over the boughs again. It shall be for the foreigner, for the fatherless, and for the widow.