2 Chronicles 23:18-19

18Then Jehoiada gave jobs to the priests and the Levites to do in the Lord's temple. That was the work that King David had told them to do in the temple. They had to offer burnt offerings as sacrifices to the Lord, and they had to praise him with happy songs. They did the things that Moses had written in God's law and that David had taught.

19Jehoiada put guards at the gates of the Lord's temple. They would stop anyone who was unclean from going in.