The Levites: Originally Consisted for Three Families or Divisions
Source: TTT
Numbers 3:17
These were the sons of Levi by name: Gershon, Kohath, and Merari.
1 Chronicles 6:16–48
The sons of Levi: Gershom, Kohath, and Merari. / These are the names of the sons of Gershom: Libni and Shimei. / The sons of Kohath: Amram, Izhar, Hebron, and Uzziel.