now therefore, behold, the Lord brings upon them
the mighty flood waters of the River:
the king of Assyria and all his glory.
It will come up over all its channels
and go over all its banks. Bible

“the River.” A common biblical idiomatic name for the Euphrates River. The people rejected the water in Judah, so metaphorically the water of Assyria will flood upon them, as the Assyrians attack. The Assyrians will overflow their channels and banks and flow out of Assyria and into Israel and Judah.

Commentary for: Isaiah 8:7