Isaiah 21:10

“O my threshing, and the corn of my floor, &c.] Which may be understood either of the Babylonians, now threshed or punished by the Lord, and whom he had made use of as instruments for the punishment of others; or rather of the people of the Jews, whom the prophet calls “his”, as being his countrymen, to whom he was affected, and with whom he sympathized; and besides, he speaks in the name of the Lord; or it is the Lord that speaks by him, calling the church of the Jews his floor, and the people his corn, which were dear and valuable to him, as choice grain, wheat, and other things; and therefore, though he threshed or afflicted them, it was for their good, to purge and cleanse them, and…”

“my threshing--that is, my people (the Jews) trodden down by Babylon. corn of my floor--Hebrew, "my son of the floor," that is, my people, treated as corn laid on the floor for threshing; implying, too, that by affliction, a remnant (grain) would be separated from the ungodly (chaff) [MAURER]. HORSLEY translates, "O thou object of my unremitting prophetic pains." See Isa 28:27-28. Some, from Jer 51:33, make Babylon the object of the threshing; but Isaiah is plainly addressing his countrymen, as the next words show, not the Babylonians. One out of Seir asks, What of the night? Is there a hope of the dawn of deliverance? Isaiah replies, The morning is beginning to dawn (to us); but night is…”

“O my threshing - The words ‘to thresh,’ ‘to tread down,’ etc., are often used in the Scriptures to denote punishments inflicted on the enemies of God. An expression likes this occurs in Jeremiah 51:33, in describing the destruction of Babylon: ‘The daughter of Babylon is like a threshing floor; it is time to thresh her.’ In regard to the mode of threshing among the Hebrews, and the pertinency of this image to the destruction of the enemies of God, see the note at Isaiah 28:27. Lowth, together with many others, refers this to Babylon, and regards it as an address of God to Babylon in the midst of her punishment: ‘O thou, the object on which I shall exercise the severity of my discipline; that…”

“Threshing - Threshing is put for the corn threshed; and the corn threshed for people sorely afflicted. This is probably spoken of Babylon. The corn - Which I will cause to be threshed upon the floor. You - Unto you my people; for all the prophecies, even concerning other nations, were published to them, and for their use and comfort. Isaiah 21:11”

“21:10 O my people: The focus shifted back to the people of Judah. • Judah would be oppressed (threshed and winnowed) by the Babylonians but Babylon, too, would fall. • I have told you everything: The prophet had been faithful in his duty to report what the Lord revealed to him.”

“my threshing: Isa 41:15, Isa 41:16; Kg2 13:7; Jer 51:33; Mic 4:13; Hab 3:12; Mat 3:12 corn: Heb. son that which: Kg1 22:14; Eze 3:17-19; Act 20:26, Act 20:27 Isaiah 21:11”

“The night vision related and recorded by the prophet, a prelude to the revelations contained in Chapters 40-60, was also intended for the consolation of Israel, which had already much to suffer, when Babylon was still Assyrian, but would have to suffer far more from it when it should become Chaldean. "O thou my threshing, and child of my threshing-floor! What I have heard from Jehovah of hosts, the God of Israel, I have declared to you." Threshing (dūsh) is a figure used to represent crushing oppression in Isa 41:15 and Mic 4:12-13; and judicial visitation in Jer 51:33 (a parallel by which we must not allow ourselves to be misled, as Jeremiah has there given a different turn to Isaiah's…”