Numbers 3:14-20

14Then the Lord spoke to Moses 1in the wilderness of Sinai, saying, 15“23Count the sons of Levi by their fathers’ households, by their families; every male from a month old and upward you shall count.” 16So Moses counted them according to the 4word of the Lord, just as he had been commanded. 175These, then, are the sons of Levi by their names: Gershon, Kohath, and Merari. 18And these are the names of the 6sons 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.