1 Chronicles 23:5-7
New International Reader's Version
5 Another 4,000 will guard the gates. And 4,000 will praise the Lord with the instruments of music I’ve provided for that purpose.”
6 David separated the Levites into groups. He did it according to the sons of Levi. The sons were Gershon, Kohath and Merari.
The Family of Gershon
7 Ladan and Shimei belonged to the family of Gershon.