Exodus 6:20
Amram married his father's sister Jochebed, and she bore him Aaron and Moses. (The length of Amram's life was 137 years.)
Exodus 2:1-2
A man from the household of Levi married a woman who was a descendant of Levi.
Numbers 26:59
Now the name of Amram's wife was Jochebed, daughter of Levi, who was born to Levi in Egypt. And to Amram she bore Aaron, Moses, and Miriam their sister.
Exodus 6:16
Now these are the names of the sons of Levi, according to their records: Gershon, Kohath, and Merari. (The length of Levi's life was 137 years.)
Exodus 6:18
The sons of Kohath were Amram, Izhar, Hebron, and Uzziel. (The length of Kohath's life was 133 years.)