1 Chronicles 23:26-29

26and also to the Levites, “They shall no longer carry the tabernacle, or any of the articles for its service.”

27For by the last words of David the Levites were numbered from twenty years old and above;

28because their duty was to help the sons of Aaron in the service of the house of the Lord, in the courts and in the chambers, in the purifying of all holy things and the work of the service of the house of God,

29both with the showbread and the fine flour for the grain offering, with the unleavened cakes and what is baked in the pan, with what is mixed and with all kinds of measures and sizes;