Numbers 3:17-20
17aThese then are the sons of Levi by their names: Gershon and Kohath and Merari.
18And these are the names of the asons of Gershon by their families: Libni and Shimei; 19and the sons of Kohath by their families: Amram and Izhar, Hebron and Uzziel; 20and the sons of Merari by their families: Mahli and Mushi. These are the families of the Levites according to their fathers’ households.