1 Chronicles 23:27-32

27for according to the last words of David, the Levites twenty years old or more were to be counted —

28“but their duty will be to assist the descendants of Aaron with the service of the Lord’s temple, being responsible for the courts and the chambers, the purification of all the holy things, and the work of the service of God’s temple —

29as well as the rows of the Bread of the Presence, the fine flour for the grain offering, the wafers of unleavened bread, the baking, the mixing, and all measurements of volume and length.

30They are also to stand every morning to give thanks and praise to the Lord, and likewise in the evening.

31Whenever burnt offerings are offered to the Lord on the Sabbaths, New Moons, and appointed festivals, they are to offer them regularly in the Lord’s presence according to the number prescribed for them.

32They are to carry out their responsibilities for the tent of meeting, for the holy place, and for their relatives, the descendants of Aaron, in the service of the Lord’s temple.”