1 Chronicles 23:5-7

New Catholic Bible

⁵ Four thousand of them were to be gatekeepers, and four thousand were to praise the Lord upon musical instruments about which David said, “I made them to praise the Lord.”

⁶ David divided the Levites of Gershon, Kohath, and Merari into groups.

⁷ From the Gershonites there were Ladan and Shimei.