Exodus 6:16-20

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. Amram took as his wife Jochebed his father’s sister, and she bore him Aaron and Moses, the years of the life of Amram being 137 years.