1 Chronicles 23:3
And the Levites were numbered from the age of thirty years and upward. And their number by their heads, man by man, was thirty-eight thousand.
1 Chronicles 23:24
These were the sons of Levi after the house of their fathers, the chief of the fathers, as they were counted by number of names by their heads, the ones who did the work for the service of the house of Jehovah, from the age of twenty years and upward.
Numbers 4:2-49
Take the sum of the sons of Kohath from among the sons of Levi, according to their families, by their fathers' house,
Treasury of Scripture Knowledge
Summary
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.
The levites
Thirty and eight
General references
Bible References
The levites
Numbers 4:2
Take the sum of the sons of Kohath from among the sons of Levi, according to their families, by their fathers' house,
Thirty and eight
Numbers 4:48
even those numbered of them were eight thousand, five hundred and eighty.
General references
Numbers 4:35
They numbered them from thirty years old and upward even to fifty years old, everyone that entered into the service, for the work in the tabernacle of the congregation.