Numbers 3:21-26

Of Gershon was the family of the Libnites and the family of the Shimeites; these were the families of the Gershonites. Their numbered men, in the numbering of every male from a month old and upward, even their numbered men were 7,500. The families of the Gershonites were to camp behind the tabernacle westward, and the leader of the fathers’ households of the Gershonites was Eliasaph the son of Lael. Now the duties of the sons of Gershon in the tent of meeting involved the tabernacle and the tent, its covering, and the screen for the doorway of the tent of meeting, and the hangings of the court, and the screen for the doorway of the court which is around the tabernacle and the altar, and its cords, according to all the service concerning them.