Numbers 4:21-28 - Duties Of The Gershonites
21 And Jehovah speaketh unto Moses, saying, 22 'Take up the sum of the sons of Gershon also by the house of their fathers, by their families; 23 from a son of thirty years and upward, till a son of fifty years thou dost number them, every one who is going in to serve the host, to do the service in the tent of meeting. 24 This is the service of the families of the Gershonite, to serve -- and for burden, 25 and they have borne the curtains of the tabernacle, and the tent of meeting, its covering, and the covering of the badger skin which is on it above, and the vail at the opening of the tent of meeting, 26 and the hangings of the court, and the vail at the opening of the gate of the court which is by the tabernacle, and by the altar round about, and their cords, and all the vessels of their service, and all that is made for them -- and they have served.
27 'By the command of Aaron and his sons is all the service of the sons of the Gershonite in all their burden, and in all their service; and ye have laid a charge on them concerning the charge of all their burden. 28 This is the service of the families of the sons of the Gershonite in the tent of meeting; and their charge is under the hand of Ithamar son of Aaron the priest.