1 Chronicles 23:24-27

24These were the sons of Levi according to their fathers' houses, the chief fathers, as they were reckoned, by number of names by their polls, who did the work of the service of the house of Jehovah, from twenty years old and upward.

25For David said, Jehovah the 1God of Israel has given rest to his people, and he will dwell in Jerusalem for ever;

26and the Levites also have no more to carry the tabernacle, nor any of its vessels for its service.

27For by the last words of David was this [done], — the numbering of the sons of Levi from twenty years old and upward.