Numbers 4:33 WEB

³¹  This is the charge of their burden, according to all their service in the Tent of Meeting: the tabernacle's boards, its bars, its pillars, its sockets,

³²  and the pillars of the court around it, and their sockets, and their pins, and their cords, with all their instruments, and with all their service: and by name you shall appoint the instruments of the charge of their burden.

³³  This is the service of the families of the sons of Merari, according to all their service, in the Tent of Meeting, under the hand of Ithamar the son of Aaron the priest.'

³⁴  Moses and Aaron and the princes of the congregation numbered the sons of the Kohathites by their families, and by their fathers' houses,

³⁵  from thirty years old and upward even to fifty years old, everyone who entered into the service, for work in the Tent of Meeting.