Numbers 4:30 WEB

²⁸  This is the service of the families of the sons of the Gershonites in the Tent of Meeting: and their charge shall be under the hand of Ithamar the son of Aaron the priest.

²⁹  'As for the sons of Merari, you shall number them by their families, by their fathers' houses;

³⁰  from thirty years old and upward even to fifty years old shall you number them, everyone who enters on the service, to do the work of the Tent of Meeting.

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.