57 These are the Levites as numbered according to their families: of Gershon, the family of the Gershonites; of Kohath, the family of the Ko'hathites; of Merar'i, the family of the Merar'ites. 58 These are the families of Levi: the family of the Libnites, the family of the He'bronites, the family of the Mahlites, the family of the Mushites, the family of the Ko'rahites. And Kohath was the father of Amram. 59 The name of Amram's wife was Joch'ebed 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, Abi'hu, Elea'zar and Ith'amar. 61 But Nadab and Abi'hu died when they offered unholy fire before the Lord. 62 And those numbered of them were twenty-three thousand, every male from a month old and upward; for they were not numbered among the people of Israel, because there was no inheritance given to them among the people 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.