Numbers 3:18

“Count the children of Levi by their fathers’ houses, by their families. You shall count every male from a month old and upward.”

Moses counted them according to the LORD’s word, as he was commanded.

These were the sons of Levi by their names: Gershon, Kohath, and Merari.

The sons of Kohath by their families: Amram, Izhar, Hebron, and Uzziel.

The sons of Merari by their families: Mahli and Mushi.

These are the families of the Levites according to their fathers’ houses.

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