10. They—change of person from "ye" (Mic 3:9); the third person puts them to a greater distance as estranged from Him. It is, literally, "Whosoever builds," singular.
build up Zion with blood—build on it stately mansions with wealth obtained by the condemnation and murder of the innocent (Jer 22:13; Eze 22:27; Hab 2:12).