Numbers 3:18, 21, 24

And these are the names of the sons of Gershon by their families: Libni and Shimei.

Of Gershon was the family of the Libnites, and the family of the Shimeites: these are the families of the Gershonites.

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