1 Chronicles 23:5-7 New Life Version (NLV)
5 There were 4,000 gate-keepers. And 4,000 were praising the Lord with the things for playing music that David had made. 6 David divided them into groups by the sons of Levi, Gershon and Kohath and Merari.
7 The sons of Gershon were Ladan and Shimei.