When the Lord finishes doing what he planned to Mount Zion and Jerusalem, he will punish Assyria. The king of Assyria is very proud, and his pride has made him do these evil things, so God will punish him.
Lord, you have left your people, the family of Jacob, because they have become filled with wrong ideas from people in the East. They try to tell the future like the Philistines, and they have completely accepted those foreign ideas.