Wherefore it shall come to pass, that when the Lord hath performed his whole work upon mount Zion and on Jerusalem, I will punish the fruit of the stout heart of the king of Assyria, and the glory of his high looks.
Wherefore it shall come to pass, (that) when the Lord hath performed his whole work - His entire plan in regard to the punishment of the Jews (Isaiah 10:5-7).
Upon mount Zion - the royal residence; the court, princes, and nobles, as distinguished from
On Jerusalem - the people in general.
I will punish the fruit - the result of; i:e., the plans emanating from "the stout heart" - Hebrew, of the greatness of; i:e., pride of the heart.
And the glory of his high looks - the haughtiness of his looks (Zechariah 1:15).