2 Samuel 8:13-18

And David made a name for himself when he returned from striking down 18,000 Edomites in the Valley of Salt. Then he put garrisons in Edom; throughout all Edom he put garrisons, and all the Edomites became David’s servants. And the LORD gave victory to David wherever he went. So David reigned over all Israel. And David administered justice and equity to all his people. Joab the son of Zeruiah was over the army, and Jehoshaphat the son of Ahilud was recorder, and Zadok the son of Ahitub and Ahimelech the son of Abiathar were priests, and Seraiah was secretary, and Benaiah the son of Jehoiada was over the Cherethites and the Pelethites, and David’s sons were priests.