Exodus 6:16-20

And these are the names of the sons of Levi according to their generations: Gershon, Kohath, and Merari; and the length of Levi’s life was 137 years.

The sons of Gershon: Libni and Shimei, according to their families.

And the sons of Kohath: Amram, Izhar, Hebron, and Uzziel; and the length of Kohath’s life was 133 years.

And the sons of Merari: Mahli and Mushi. These are the families of the Levites according to their generations.

Now Amram married his father’s sister Jochebed, and she bore him Aaron and Moses; and the length of Amram’s life was 137 years.