Numbers 3:13-19
English Standard Version
14And the Lord spoke to Moses in the wilderness of Sinai, saying,
15"List the sons of Levi, by fathers ' houses and by clans; every male from a month old and upward you shall list."
16So Moses listed them according to the word of the Lord, as he was commanded.
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 clans: Libni and Shimei.
19And the sons of Kohath by their clans: Amram, Izhar, Hebron, and Uzziel.