1 Chronicles 23:27 in the King James Version
For by the last words of David the Levites were numbered from twenty years old and above:
Context
26 Also the Levites will no longer need to carry the tabernacle and all its vessels for its service.”
27 For by the last words of David the sons of Levi were counted, from twenty years old and upward.
28 For their duty was to wait on the sons of Aaron for the service of the LORD’s house—in the courts, in the rooms, and in the purifying of all holy things, even the work of the service of God’s house;