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17And these were the sons of Levi by their names; Gershon, and Kohath, and Merari. 18And these are the names of the sons of Gershon by their families; Libni, and Shimei. 19And the sons of Kohath by their families; Amram, and Izehar, Hebron, and Uzziel. 20And the sons of Merari by their families; Mahli, and Mushi. These are the families of the Levites according to the house of their fathers.
Numbers 3:17-20 (KJV)