Numbers 1:47
The Exemption of the Levites
1:47 But the Levites, according to the tribe of their fathers, were not numbered among them.
Numbers 2:33
2:33 But the Levites were not numbered among the other Israelites, as the Lord commanded Moses.
Numbers 26:62
26:62 Those of them who were numbered were 23,000, all males from a month old and upward, for they were not numbered among the Israelites; no inheritance was given to them among the Israelites.