Shall leave an hundred. — i.e., shall have an hundred only as a remnant of the thousand who went forth to war. The great cities were to be decimated in the coming struggle with Assyria.
Related Commentaries of Amos 5:3
Amos 5:3
3 For thus saith the Lord GOD; The city that went out by a thousand shall leave an hundred, and that which went forth by an hundred shall leave ten, to the house of Israel.