John Gill Commentary 1 Chronicles 6:16

"The sons of Levi: Gershom, Kohath, and Merari." — 1 Chronicles 6:16 (ASV)

The sons of Levi, Gershon, Kohath, and Merari .
] Which is repeated from (1 Chronicles 6:1) for the sake of their posterity, whose names are given in the three following verses, in the same manner as in (Exodus 6:17–19) .