2 Samuel 8:13-18

So David became even more famous when he returned from destroying 18,000 Edomites in the Valley of Salt. He placed army garrisons throughout Edom, and all the Edomites became David’s subjects. In fact, the LORD made David victorious wherever he went. So David reigned over all Israel and did what was just and right for all his people. Joab son of Zeruiah was commander of the army. Jehoshaphat son of Ahilud was the royal historian. Zadok son of Ahitub and Ahimelech son of Abiathar were the priests. Seraiah was the court secretary. Benaiah son of Jehoiada was captain of the king’s bodyguard. And David’s sons served as priestly leaders.