They build up Zion with blood, and Jerusalem with iniquity. They - change of person from "ye" (Micah 3:9); the third person puts them to a greater distance, as estranged from him. It is literally 'Whosoever builds,' sing.
Build up Zion with blood - build on it stately mansions with wealth obtained by the condemnation and murder of the innocent (Jeremiah 22:13; Ezekiel 22:27; Habakkuk 2:12).