Numbers 4:21-28 - Duties Of The Gershonites
21 And Jehovah spoke to Moses, saying, 22 Take also the sum of the sons of Gershon throughout the houses of their fathers by their families. 23 From thirty years old and upward to fifty years old you shall number them, all that enter in to perform the service, to do the work in the tabernacle of the congregation. 24 This is the service of the families of the Gershonites, to serve and to carry burdens. 25 And they shall carry the curtains of the tabernacle, and the tabernacle of the congregation, its covering, and the covering of the dugong skins that is above upon it, and the hanging for the door of the tabernacle of the congregation, 26 and the hangings of the court, and the hanging for the door of the gate of the court, which is by the tabernacle and by the altar all around, and their cords, and all the instruments of their service, and all that is made for them. So they shall serve.
27 At the appointment of Aaron and his sons shall be all the service of the sons of the Gershonites, in all their burdens and in all their service. And you shall appoint all their burdens to the ones in charge. 28 This is the service of the families of the sons of Gershon in the tabernacle of the congregation. And their charge shall be under the hand of Ithamar the son of Aaron the priest.