A man from the household of Levi married a woman who was a descendant of Levi.

Reuben, Simeon, Levi, and Judah,

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.)

The sons of Merari were Mahli and Mushi. These were the clans of Levi, according to their records.

So Moses stood at the entrance of the camp and said, “Whoever is for the Lord, come to me.” All the Levites gathered around him,

The Levites did what Moses ordered, and that day about three thousand men of the people died.