2 Chronicles 23:18-19

Then Jehoiada placed the oversight of the temple of the LORD in the hands of the Levitical priests, to whom David had made assignments in the temple, to present the burnt offerings of the LORD as written in the Law of Moses, with rejoicing and singing, as David had ordered. He also stationed gatekeepers at the gates of the LORD’s temple so that no one who was in any way unclean might enter.