Numbers 4:22-28

22“Take a census of the Gershonites as well, by their families and clans, 23from thirty to fifty years old, counting everyone who comes to serve in the work at the Tent of Meeting.

24This is the service of the Gershonite clans regarding work and transport: 25They are to carry the curtains of the tabernacle, the Tent of Meeting with the covering of fine leather over it, the curtains for the entrance to the Tent of Meeting, 26the curtains of the courtyard, and the curtains for the entrance at the gate of the courtyard that surrounds the tabernacle and altar, along with their ropes and all the equipment for their service. The Gershonites will do all that needs to be done with these items.

27All the service of the Gershonites—all their transport duties and other work—is to be done at the direction of Aaron and his sons; you are to assign to them all that they are responsible to carry. 28This is the service of the Gershonite clans at the Tent of Meeting, and their duties shall be under the direction of Ithamar son of Aaron the priest.