1 Kings 11:14-16

Young's Literal Translation

¹⁴ And Jehovah raiseth up an adversary to Solomon, Hadad the Edomite; of the seed of the king [is] he in Edom;

¹⁵ and it cometh to pass, in David's being with Edom, in the going up of Joab head of the host to bury the slain, that he smiteth every male in Edom --

¹⁶ for six months did Joab abide there, and all Israel, till the cutting off of every male in Edom --