Unit 1 (v. 12a): “Therefore… Zion… plowed as a field”
Micah signals a conclusion (“therefore”) and assigns responsibility (“for your sake”), linking the coming disaster to the conduct addressed just before this verse. “Zion” (the city’s core) being “plowed” pictures total reversal: instead of a protected urban stronghold, the central area becomes open ground worked like common farmland.
Unit 2 (v. 12b): “Jerusalem shall become heaps”
The prophecy shifts from the image of farming to the direct result in the built environment. “Heaps” suggests collapsed structures and broken stone, the aftermath of destruction rather than mere decline. The city is not described as captured and occupied, but as reduced to rubble.
Unit 3 (v. 12c): “the mountain of the house… like the high places of a forest”
The “mountain of the house” refers to the temple mount, the most symbolically loaded location in the city (temple). It will become like “wooded heights,” implying abandonment and overgrowth. The point is not simply that worship stops, but that the site loses its cultivated, constructed, maintained character and resembles uncared-for high ground.