Numbers 3:18-26
And these are the names of the sons of Gershon by their families; Libni, and Shimei.
Nave's Topical Index—AKJV

Numbers 4:23-26
From thirty years old and upward until fifty years old shall you number them; all that enter in to perform the service, to do the work in the tabernacle of the congregation.
Nave's Topical Index—AKJV

Numbers 10:17
And the tabernacle was taken down; and the sons of Gershon and the sons of Merari set forward, bearing the tabernacle.
Nave's Topical Index—AKJV