Exodus 6:16-19

These are the names of the sons of Levi according to their generations: Gershon, Kohath, and Merari, the years of the life of Levi being 137 years. The sons of Gershon: Libni and Shimei, by their clans. The sons of Kohath: Amram, Izhar, Hebron, and Uzziel, the years of the life of Kohath being 133 years. The sons of Merari: Mahli and Mushi. These are the clans of the Levites according to their generations.