Numbers 4:34 in the World English Bible
Moses and Aaron and the princes of the congregation counted the sons of the Kohathites by their families, and by their fathers’ houses,
Context
33 This is the service of the families of the sons of Merari, according to all their service, in the tabernacle of the congregation, under the hand of Ithamar the son of Aaron the priest.
34 And Moses and Aaron and the chief of the congregation numbered the sons of the Kohathites after their families, and after the house of their fathers,
35 From thirty years old and upward even unto fifty years old, every one that entereth into the service, for the work in the tabernacle of the congregation: