Numbers 3:23

21Of Gershon was the family of the Libnites, and the family of the Shimeites. These are the families of the Gershonites.

22Those who were counted of them, according to the number of all the males from a month old and upward, even those who were counted of them were seven thousand five hundred.

23The families of the Gershonites shall encamp behind the tabernacle westward.

24Eliasaph the son of Lael shall be the prince of the fathers’ house of the Gershonites.

25The duty of the sons of Gershon in the Tent of Meeting shall be the tabernacle, the tent, its covering, the screen for the door of the Tent of Meeting,