Numbers 1:49

“Only the tribe of Levi you shall not number, nor shall you take their census among the sons of Israel [since they are unavailable to go to war].

Numbers 26:62

Those numbered of the Levites were 23,000, every male from a month old and upward; for they were not numbered among the sons of Israel, since no inheritance [of land] was given to them among the Israelites.

Numbers 2:33

But the Levites were not numbered with the [other] Israelites, just as the Lord had commanded Moses.

Treasury of Scripture Knowledge

Summary

Only thou shalt not number the tribe of Levi, neither take the sum of them among the children of Israel:

General references

Bible References

General references

Numbers 2:33
But the Levites were not numbered with the [other] Israelites, just as the Lord had commanded Moses.
Numbers 26:62
Those numbered of the Levites were 23,000, every male from a month old and upward; for they were not numbered among the sons of Israel, since no inheritance [of land] was given to them among the Israelites.