Exodus 6:16-19

¹⁶And these are the names of the sons of Levi according to their generations: Gershon, and Kohath, and Merari; and the years of the life of Levi were a hundred thirty and seven years. ¹⁷The sons of Gershon: Libni and Shimei, according to their families. ¹⁸And the sons of Kohath: Amram, and Izhar, and Hebron, and Uzziel; and the years of the life of Kohath were a hundred thirty and three years. ¹⁹And the sons of Merari: Mahli and Mushi. These are the families of the Levites according to their generations.