1 Chronicles 23:24-27

24These were the sons of Levi by their fathers’ houses—the heads of the fathers’ houses as they were counted individually by the number of their names, who did the work for the service of the house of the Lord, from the age of twenty years and above.

25For David said, “The Lord God of Israel has given rest to His people, that they may dwell in Jerusalem forever”;

26and also to the Levites, “They shall no longer carry the tabernacle, or any of the articles for its service.”

27For by the last words of David the Levites were numbered from twenty years old and above;