1 Kings 11:14-17

14And Jehovah stirred up an adversary to Solomon, Hadad the Edomite; he was of the king's seed in Edom.

15Now it came to pass when David was in Edom, when Joab the captain of the host had gone up to bury the slain, after he had smitten every male in Edom

16(for Joab abode there six months with all Israel, until he had cut off every male in Edom),

17that Hadad fled, he and certain Edomites of his father's servants with him, to go into Egypt, Hadad being yet a little child.