Reach — So that they shall be in great danger of being desired. 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 Judah's land, when Sennacherib took all the fenced cities of Judah, 2 Kings 18:13, and sent his army against Jerusalem. Wings — Of his forces, or of the wings of his army, as they still are called. My land — Of the land of Judah, so called because the Messiah, who is called Immanuel, should be born 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 Judah, and whereas Israel should not be a people, Judah should be restored, for the sake of the Messiah, to be the place of his birth and ministry.
Related Commentaries of Isaiah 8:8
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.