1 Kings 11:14-16

14And Jehovah raised up an adversary unto Solomon, Hadad the Edomite: he was of the king’s seed in Edom. 15For it came to pass, when David was in Edom, and Joab the captain of the host was gone up to bury the slain, and had smitten every male in Edom 16(for Joab and all Israel remained there six months, until he had cut off every male in Edom);