1 Chronicles 23:6

And David organized them in divisions corresponding to the sons of Levi : Gershon , Kohath , and Merari .

David separated the Levites into divisions corresponding to the sons of Levi: Gershon, Kohath and Merari.

And David divided them into courses among the sons of Levi, namely , Gershon, Kohath, and Merari.