harvest, put for "corn" by Figure of speech Metonymy (of Adjunct). See App-6.
stranger... fatherless... widow. Not the tramp, or ne'erdo- well, or the drunkard. And in kind, not money
Related Commentaries of Deuteronomy 24:19
Deuteronomy 24:19
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.