Jehu did not kill all of these people personally, rather he commanded for them to be killed. Alternate translation: "So Jehu commanded for all ... to be killed" or "So Jehu commanded for all ... to die" (See: [[rc://en/ta/man/jit/figs-metonymy]])
This means that none of Ahab's family, friends, and loyal officials were alive. Alternate translation: "until all of his people were dead" (See: [[rc://en/ta/man/jit/figs-euphemism]])