Summary of passage: The Lord will bring Assyria and flies from Egypt and bees from Assyria to shave his people’s head and legs. The remnant will eat curds and honey. The land will only have briers and thorns. Damascus and Samaria (Israel) will fall because they have rejected him. Judah will be overrun but will be spared in the end by God.
10a) The Lord will whistle for flies from Egypt and bees from Assyria. Assyria will shave his people’s heads and legs. Because his people have rejected the waters of Shiloah and rejoices over Rezin and the son of Remaliah.
11) The wealth of Damascus and the plunder of Samaria (Israel) will be carried away but Judah will be spared.
12) This people are God’s people. You nations are God’s enemies or not God’s people. God will thwart them. Assyria will pass through but spare Judah.
Conclusions: I had to read this carefully. It was a lot of analogies and euphemisms to sort through but in the end, the message was simple: Judah will be spared (for now anyways).