1 Chronicles 18:11-15

Them also king David dedicated unto the LORD, with the silver and the gold that he brought from all these nations; from Edom, and from Moab, and from the children of Ammon, and from the Philistines, and from Amalek.

Moreover Abishai the son of Zeruiah slew of the Edomites in the valley of salt eighteen thousand.

And he put garrisons in Edom; and all the Edomites became David’s servants. Thus the LORD preserved David whithersoever he went.

So David reigned over all Israel, and executed judgment and justice among all his people.

And Joab the son of Zeruiah was over the host; and Jehoshaphat the son of Ahilud, recorder.