Numbers 4:33-35

New King James Version

³³ This is the service of the families of the sons of Merari, as all their service for the tabernacle of meeting, under the ^[a]authority of Ithamar the son of Aaron the priest.”

Census of the Levites

^34 (A)And Moses, Aaron, and the leaders of the congregation numbered the sons of the Kohathites by their families and by their fathers’ house, ³⁵ from thirty ^(B)years old and above, even to fifty years old, everyone who entered the service for work in the tabernacle of meeting;