When you get in the grain from your field, if some of the grain has been dropped by chance in the field, do not go back and get it, but let it be for the man from a strange land, the child without a father, and the widow: so that the blessing of the Lord your God may be on all the work of your hands. When you are shaking the fruit from your olive-trees, do not go over the branches a second time: let some be for the man from a strange land, the child without a father, and the widow. When you are pulling the grapes from your vines, do not take up those which have been dropped; let them be for the man from a strange land, the child without a father, and the widow. (Deuteronomy, 24:19-21)