1 Chronicles 23:3

and the Levites are numbered from a son of thirty years and upward, and their number, by their polls, is of mighty men thirty and eight thousand.

1 Chronicles 23:24

These are sons of Levi, by the house of their fathers, heads of the fathers, by their appointments, in the number of names, by their polls, doing the work for the service of the house of Jehovah, from a son of twenty years and upward,

Numbers 4:2-49

'Take up the sum of the sons of Kohath from the midst of the sons of Levi, by their families, by the house of their fathers;

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 up the sum of the sons of Kohath from the midst of the sons of Levi, by their families, by the house of their fathers;

Thirty and eight

Numbers 4:48
even their numbered ones are eight thousand and five hundred and eighty;

General references

Numbers 4:35
from a son of thirty years and upward even unto a son of fifty years, every one who is going in to the host, for service in the tent of meeting,