And he shall pass through Judah— The meaning is, that the Assyrian, after he had swallowed up Syria, and then the kingdom of Ephraim, should pass into Judaea, and occupy with his forces the whole of it, except Jerusalem, its metropolis; which refers to the time of Sennacherib. See 2 Kings 18:13-14. The reader will observe, that in this and the preceding verses, the ideas are taken from the overflowing of the river Euphrates except that in the latter clause a new metaphor is introduced where the spreading of the wings alludes to the wings of Sennacherib's army. See Daniel 9:27.
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.