Numbers 4:2-4

Amplified Bible

² “Take a census of the sons of Kohath from among the sons of Levi, by their families (clans), by their fathers’ households, ³ from thirty years old and upward, even to fifty years old, all who enter the service to do the work in the Tent of Meeting (tabernacle). ⁴ This is the work and responsibility of the sons of Kohath in the Tent of Meeting (tabernacle): the most holy things.