1 Chronicles 6:1, 16-17, 20

The sons of Levi; Gershon, Kohath, and Merari.

The sons of Levi; Gershom, Kohath, and Merari. And these be the names of the sons of Gershom; Libni, and Shimei.

Of Gershom; Libni his son, Jahath his son, Zimmah his son