For it came to pass, when David was in Edom, and Joab the captain of the host was gone up to bury the slain, and had smitten every male in Edom

Earlier, when David was in Edom, Joab the commander of the army had gone to bury the dead and had struck down every male in Edom.

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--

Now 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