What does Jeremiah 43:12 mean?

He will set fire to the temples of Egypt's gods, burn them down, and take their idols as loot. He will sweep through Egypt like a shepherd picking lice off his clothes, and then leave without a care. Jeremiah 43:12 - Modern Text Bible

(God says Nebuchadnezzar will destroy Egypt's religious centers and take their treasures, showing how powerless Egypt's gods are. The image of a shepherd picking lice shows how easy it will be for him.)