1 Kings (Author Compiled by Isaiah and Jeremiah from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
11:15Now 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
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.