ישעיהו י:יב פירוש: רש״י ואבן עזרא

And it shall be, when the Lord completes... But it did not come about as he thought, but, after the Holy One, blessed be He, completes all His work and His vengeance against Israel and against some of the cities of Judea, and because of that fear, the inhabitants of Zion and Jerusalem will be humbled to return to Me, I will let the king of Assyria know that not by his power was he victorious.

יבצע He will perform (comp. Zach. 4:9).

I will visit retribution upon the increase of the arrogance of the king of Assyria’s heart For that which he increased the arrogance of the king of Assyria’s heart, to boast of his power falsely. The fruit of the arrogance is craysement de grandeze in O.F., increase of arrogance, of Sennacherib’s heart.