Numbers 26:59-63

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 their sister Miriam.

And to Aaron were born Nadab and Abihu, Eleazar and Ithamar.

But Nadab and Abihu died when they offered strange fire before the Lord.

Those who were numbered of them were twenty-three thousand, every male from a month old and upward, for they were not numbered among the sons of Israel since no inheritance was given to them among the sons of Israel.

These are the ones who were numbered by Moses and Eleazar the priest, who numbered the sons of Israel in the plains of Moab by the Jordan at Jericho.