1 Kings 11:14-17
And the LORD raised up an adversary against Solomon, Hadad the Edomite. He was of the royal house in Edom. For when David was in Edom, and Joab the commander of the army went up to bury the slain, he struck down every male in Edom (for Joab and all Israel remained there six months, until he had cut off every male in Edom). But Hadad fled to Egypt, together with certain Edomites of his father’s servants, Hadad still being a little child.
English Standard Version (ESV)