For your sake — Because of your sins. The mountain — The mountain, on which the temple stood. This is that passage, which is quoted, Jeremiah 26:18, which Hezekiah and his princes took well: yea, they repented and so the execution of it did not come in their days.
Related Commentaries of Micah 3:12
Micah 3:12
12 Therefore shall Zion for your sake be plowed as a field, and Jerusalem shall become heaps, and the mountain of the house as the high places of the forest.