Numbers 4:22-35

²²“Take a census of the sons of Gershon also, by their fathers’ households, by their families; ²³from thirty years old and upward to fifty years old you shall count them: all who can enter to perform service, to do the work in the tent of meeting. ²⁴This is the service of the families of the Gershonites, in serving and in carrying: ²⁵they shall carry the curtains of the tabernacle and the tent of meeting with its covering and the covering of fine leather that is on top of it, and the curtain for the entrance of the tent of meeting, ²⁶and the curtains of the courtyard, the curtain for the entrance of the gate of the courtyard that is around the tabernacle and the altar, and their ropes and all the equipment for their service; and everything that is to be done by them, they shall perform. ²⁷All the service of the sons of the Gershonites, that is, all their loads and all their work, shall be performed at the command of Aaron and his sons; and you shall assign to them as a duty all their loads. ²⁸This is the service of the families of the sons of the Gershonites in the tent of meeting; and their duties shall be under the direction of Ithamar the son of Aaron the priest.

²⁹“As for the sons of Merari, you shall count them by their families, by their fathers’ households; ³⁰from thirty years old and upward, even to fifty years old, you shall count them, everyone who can enter the service to do the work of the tent of meeting. ³¹Now this is the duty of their loads, for all their service in the tent of meeting: the boards of the tabernacle, its bars, its pillars, and its bases, ³²and the pillars around the courtyard and their bases, their pegs, and their ropes, with all their equipment and with all their service; and you shall assign by names of the men the items that each is to carry. ³³This is the service of the families of the sons of Merari, according to all their service in the tent of meeting, under the direction of Ithamar the son of Aaron the priest.”

³⁴So Moses, Aaron, and the leaders of the congregation counted the sons of the Kohathites by their families and by their fathers’ households, ³⁵from thirty years old and upward even to fifty years old, everyone who could enter the service for work in the tent of meeting.