Numbers 3:24-28

and the leader of the fathers’ households of the Gershonites: Eliasaph the son of Lael. Duties of the Levites

Now the duties of the sons of Gershon in the tent of meeting included the tabernacle and the tent, its covering, and the curtain for the entrance of the tent of meeting,

and the curtains of the courtyard, the curtain for the entrance of the courtyard which is around the tabernacle and the altar, and its ropes, according to all the service concerning them.

Of Kohath was the family of the Amramites, the family of the Izharites, the family of the Hebronites, and the family of the Uzzielites; these were the families of the Kohathites.

In the counting of every male from a month old and upward, there were 8,600, performing the duties of the sanctuary.