1 Chronicles 23:3, 24, 26-27
1 Chronicles 23:3 KJV
Now the Levites were numbered from the age of thirty years and upward: and their number by their polls, man by man, was thirty and eight thousand.
1 Chronicles 23:26-27 KJV
and also unto the Levites; they shall no more carry the tabernacle, nor any vessels of it for the service thereof. For by the last words of David the Levites were numbered from twenty years old and above