1 Chronicles 23:24-26

24These were the sons of Levi by clans, with the heads of clans as they were enrolled and with a list of their names by heads who carried out the task of avodah in the House of Adonai from 20 years old and upward.

25For David said: “Adonai, the God of Israel, has given His people rest and He dwells in Jerusalem forever.

26Therefore, the Levites need not carry the Tabernacle and all the vessels for avodah.”