1 Chronicles 23:1-5

When David was an old man, he appointed his son Solomon to be king over Israel. David summoned all the leaders of Israel, together with the priests and Levites. All the Levites who were thirty years old or older were counted, and the total came to 38,000. Then David said, “From all the Levites, 24,000 will supervise the work at the Temple of the LORD. Another 6,000 will serve as officials and judges. Another 4,000 will work as gatekeepers, and 4,000 will praise the LORD with the musical instruments I have made.”