Numbers 4:22-28

22“Take a census also of the sons of Gershon, by their ancestral households and by their families.

23Count all the males from 30 to 50 years of age, everyone coming to work in the service of the Tent of Meeting.

24This is the task of the Gershonite families in working and carrying burdens.

25They are to carry the curtains of the Tabernacle, the Tent of Meeting, its covering, the outer covering of porpoise hide, the curtains for the entrance for the Tent of Meeting,

26the curtains surrounding the courtyard and the altar, the curtain for the entrance, the ropes and all the equipment used in its operations. They are to do all that needs to be done with these things.

27The sons of the Gershonites are to do all their tasks, whether carrying or doing other work, according to the word of Aaron and his sons. You are to assign to them all that is their responsibility to carry.

28This is the duty of the families of the sons of the Gershonites regarding the Tent of Meeting. Their duty will be under the direction of Ithamar son of Aaron the kohen.