57 And these are the numbered of the Levites, after their families: of Gershon, the family of the Gershonites; of Kohath, the family of the Kohathites; of Merari, the family of the Merarites. 58 These are the families of the Levites: the family of the Libnites, the family of the Hebronites, the family of the Mahlites, the family of the Mushites, the family of the Korahites.—And Kohath begot Amram. 59 And the name of Amram's wife was Jochebed, the daughter of Levi, who was born to Levi in Egypt; and she bore to Amram Aaron and Moses, and Miriam their sister. 60 And to Aaron were born Nadab, and Abihu, Eleazar, and Ithamar. 61 And Nadab and Abihu died, when they presented strange fire before Jehovah. 62 And those that were numbered of the [Levites] were twenty-three thousand, all males from a month old and upward; for they were not numbered among the children of Israel, because there was no inheritance given them among the children of Israel.
Matthew Henry's Commentary on Numbers 26:57-62
Commentary on Numbers 26:57-62
(Read Numbers 26:57-62)
Levi was God's tribe; therefore it was not numbered with the rest, but alone. It came not under the sentence, that none of them should enter Canaan excepting Caleb and Joshua.