2 Chronicles 23:18-19

18Also Jehoiada placed the offices and officers of the house of the Lord under the authority of the Levitical priests, whom David had [previously] assigned over the house of the Lord, to offer the burnt offerings of the Lord, as it is written in the Law of Moses, with rejoicing and singing in accordance with the order of David.

19Jehoiada stationed the gatekeepers [at the gates] of the house of the Lord, so that no one would enter who was in any way unclean.