Numbers 4:22

Amplified Bible

“Take a census of the sons of Gershon also, by their fathers’ households, by their families.

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These are the names of the [two] sons of Gershon by their families: Libni and Shimei;

Of Gershon were the families of the Libnites and of the Shimeites. These are the families of the Gershonites.

and the leader of the fathers’ households of the Gershonites was Eliasaph the son of Lael.

Then the Lord spoke to Moses, saying,

From thirty years and upward to fifty years old, you shall number them; all who enter for service to do the work in the Tent of Meeting.