Numbers 3:17-26

17And these were the sons of Levi by their names; Gershon, and Kohath, and Merari. 18And these are the names of the sons of Gershon by their families; Libni, and Shimei. 19And the sons of Kohath by their families; Amram, and Izehar, Hebron, and Uzziel. 20And the sons of Merari by their families; Mahli, and Mushi. These are the families of the Levites according to the house of their fathers. 21Of Gershon was the family of the Libnites, and the family of the Shimites: these are the families of the Gershonites. 22Those that were numbered of them, according to the number of all the males, from a month old and upward, even those that were numbered of them were seven thousand and five hundred. 23The families of the Gershonites shall encamp behind the tabernacle westward. 24And the head of the house of the father of the Gershonites shall be Eliasaph the son of Lael. 25And the charge of the sons of Gershon in the tabernacle of the congregation shall be the tabernacle, and the tent, its covering and the hanging for the door of the tabernacle of the congregation, 26And the hangings of the court, and the curtain for the door of the court, which is around the tabernacle, and the altar, and the cords of it for all the service of it.