1 Chronicles 23:26-29

26Also, the Levites will no longer need to carry the tabernacle and all its utensils for its service.”

27For by the last words of David, the Levites from twenty years old and above were counted.

28For their duty is to assist [the priests] the sons of Aaron in the service of the house of the Lord, in [caring for] the courtyards, the chambers, the purifying of all holy things, and any work of the service of the house of God,

29and with the showbread, and the fine flour for a grain offering, and unleavened wafers, or what is baked in the pan or what is well-mixed, and all measures of volume and size [as the Law of Moses required].