Deuteronomy 24:19-21

VIN(i) 19 When you reap your harvest in your field and have forgotten a sheaf in the field, do not go back to get it. It shall be for the foreigner, for the fatherless and for the widow, so that the LORD your God may bless you in all the work of your hands. 20 "When you harvest the olives from your trees, don't go back to the branches a second time. What remains is for the foreigner, the orphan, or the widow. 21 "When you harvest the grapes in your vineyard, don't go back a second time. What remains are for the foreigner, the orphan, or the widow.