1 Chronicles 23:3

And the Levites were numbered from thirty years old and upward: and their number by their polls, man by man, was thirty and eight thousand.

1 Chronicles 23:24

These were the sons of Levi after their fathers houses, even the heads of the fathers houses of those of them that were counted, in the number of names by their polls, who did the work for the service of the house of Jehovah, from twenty years old and upward.

Numbers 4:2-49

Take the sum of the sons of Kohath from among the sons of Levi, by their families, by their fathers houses,

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, by their families, by their fathers houses,

Thirty and eight

Numbers 4:48
even those that were numbered of them, were eight thousand and five hundred and fourscore.

General references

Numbers 4:35
from thirty years old and upward even unto fifty years old, every one that entered upon the service, for work in the tent of meeting:

American Standard Version Public Domain