2 Chronicles 23:18-19 (ESV)

"And Jehoiada posted watchmen for the house of the Lord under the direction of wthe Levitical priests and the Levites xwhom David had organized to be in charge of the house of the Lord, to offer burnt offerings to the Lord, yas it is written in the Law of Moses, with rejoicing and with singing, zaccording to the order of David. 19 He stationed athe gatekeepers at the gates of the house of the Lord so that no one should enter who was in any way unclean."