Numbers 3:21-26
21Of Gershon was the family of the Libnites and the family of the Shimeites; these were the families of the Gershonites. 22Their numbered men, in the numbering of every male from a month old and upward, even their numbered men were 7,500. 23The families of the Gershonites were to camp behind the tabernacle westward, 24and the leader of the fathers’ households of the Gershonites was Eliasaph the son of Lael.
Responsibilities of the Priests
25Now athe responsibility of the sons of Gershon in the tent of meeting involved the tabernacle and bthe tent, its covering, and cthe screen for the doorway of the tent of meeting, 26and athe hangings of the court, and bthe screen for the doorway of the court which is around the tabernacle and the altar, and its cords, according to all the service 1concerning them.