Numbers 4
21 Yahweh spoke to Moses, saying,
22 Ref "Take a census of the sons of Gershon also, by their fathers' houses, by their families;
23 Ref from thirty years old and upward until fifty years old shall you number them; all who enter in to wait on the service, to do the work in the Tent of Meeting.
24 Ref This is the service of the families of the Gershonites, in serving and in bearing burdens:
25 Ref they shall carry the curtains of the tabernacle, and the Tent of Meeting, its covering, and the covering of sealskin that is above on it, and the screen for the door of the Tent of Meeting,
26 Ref and the hangings of the court, and the screen for the door of the gate of the court, which is by the tabernacle and around the altar, and their cords, and all the instruments of their service, and whatever shall be done with them. Therein shall they serve.
27 Ref At the commandment of Aaron and his sons shall be all the service of the sons of the Gershonites, in all their burden, and in all their service; and you shall appoint to them in charge all their burden.
28 Ref 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 Ref "As for the sons of Merari, you shall number them by their families, by their fathers' houses;
30 Ref 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 Ref 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 Ref 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 Ref 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."