Matthew Poole and continuators on Isaiah 8:8

8 And he shall pass through Judah , he shall overflow and go over, he shall reach even to the neck , and the stretching out of his wings shall fill the breadth of thy land, O Immanuel .

Or, it, to wit, the River, v. 7. which yet designs the same Person and Thing, to wit, the Invasion of the King of Assyria.

And when he shall have finished his Work against you, he shall invade the Land of Iudah, as Sennacherib did some few years after his Conquest of Samaria, 2 Kings 18. 9, 13.

So as they shall be in great danger of being drowned or destroyed. He persists in the Metaphor of a River swelling so high as to reach to a man's Neck, and be ready to overwhelm him. Such was the danger of Iudahs Land, when Sennacherib took all the fenced Cities of Iudah, 2 Kings 18. 13. and sent his Army against Ierusalem.

Of his Forces, or of the Wings of his Army, as they anciently were and still are called.

Of the Land of Iudah, so called because the Messiah, who is called by God himself Immanuel, ch. 7. 14. should certainly be born and live and die there. And this is added emphatically for the Consolation of God's People, to assure them, that notwithstanding this dreadful Scourge, yet God would make a difference between Israel and Iudah, and whereas Israel should be so broken by the Assyrian, that they should not be a people, as was threatned ch. 7. 8. Iudah should be restored and preserved, for the sake of the Messiah, to be the Place of his Birth and Ministry▪ according to that famous Prophecy, Gen. 49. 10.

Marginal references: Heb. the fulness of the breadth of thy land shall be the stretchings out of his wings.; Chap. 7. 14.