1 Chronicles 23:5-7

Darby Translation

⁵ and four thousand were doorkeepers; and four thousand praised Jehovah with the instruments which I made, [said David,] to praise [therewith].

⁶ And David divided them into courses according to the sons of Levi: Gershon, Kohath, and Merari.

⁷ Of the Gershonites: Laadan and Shimei.