Kings III 11:16

16 (for Joab and all Israel abode there six months in Idumaea, until he utterly destroyed every male in Idumaea;)

Kings III 11:16 In-Context

14 And the Lord raised up an enemy to Solomon, Ader the Idumaean, and Esrom son of Eliadae who in Raama, Adadezer king of Suba his master; (and men gathered to him, and he was head of the conspiracy, and he seized on Damasec,) and they were adversaries to Israel all the days of Solomon: and Ader the Idumaean of the seed royal in Idumaea.
15 And it happened, that while David was utterly destroying Edom, while Joab captain of the host was going to bury the dead, when they slew every male in Idumaea;
16 (for Joab and all Israel abode there six months in Idumaea, until he utterly destroyed every male in Idumaea;)
17 that Ader ran away, he and all the Idumaeans of the servants of his father with him; and they went into Egypt; and Ader a little child.
18 And there rise up men out of the city of Madiam, and they come to Pharan, and take men with them, and come to Pharao king of Egypt: and Ader went in to Pharao, and he gave him a house, and appointed him provision.

The Brenton translation of the Septuagint is in the public domain.