John Gill Commentary Numbers 3:17

"And these were the sons of Levi by their names: Gershon, and Kohath, and Merari." — Numbers 3:17 (ASV)

And these were the sons of Levi, by their names
The immediate offspring and descendants of that patriarch: Gershon, and Kohath, and Merari ;
these went down with him into Egypt, (Genesis 46:11) .