The LORD shall bring upon thee, and upon thy people, and upon thy father's house, days that have not come, from the day that Ephraim departed from Judah; even the king of Assyria. The Lord shall bring "But Jehovah will bring" - Houbigant reads וביא vaiyabi, from the Septuagint, αλλα επαξει ὁ Θεος, to mark the transition to a new subject.
Even the king of Assyria - Houbigant supposes these words to have been a marginal gloss, brought into the text by mistake; and so likewise Archbishop Secker. Besides their having no force or effect here, they do not join well in construction with the words preceding, as may be seen by the strange manner in which the ancient interpreters have taken them; and they very inelegantly forestall the mention of the king of Assyria, which comes in with great propriety in the 20th verse (Isaiah 7:20). I have therefore taken the liberty of omitting them in the translation.