Numbers 26:57

Now these were the Levites numbered by their clans: The Gershonite clan from Gershon, the Kohathite clan from Kohath, and the Merarite clan from Merari.

¶ And these are they that were numbered of the Levites after their families: of Gershon, the family of the Gershonites: of Kohath, the family of the Kohathites: of Merari, the family of the Merarites.