1 Chronicles 23:28

“But let no one enter the house of Yahweh except the priests and the ministering Levites; they may enter, for they are holy. And let all the people keep the charge of Yahweh.

And Jehoiada placed the assignments concerning the house of Yahweh in the hand of the Levitical priests, whom David had divided by lot to be over the house of Yahweh, to offer the burnt offerings of Yahweh, as it is written in the law of Moses—with gladness and singing according to the order of David.

And they gathered their brothers, set themselves apart as holy, and went in to cleanse the house of Yahweh, according to the commandment of the king by the words of Yahweh.

And Hezekiah set up the divisions of the priests and the Levites by their divisions, each according to his service, both the priests and the Levites, for burnt offerings and for peace offerings, to minister and to give thanks and to praise in the gates of the camp of Yahweh.

Then he brought me into the outer court, and behold, there were chambers and a pavement made for the court all around; thirty chambers faced the pavement.

“Yet I will appoint them as keepers of the responsibility for the house, of all its service and of all that shall be done in it.