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 are the names of the sons of Gershom: Libni and Shimei.

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