Numbers 26:3-5

Amplified Bible

³ So Moses and Eleazar the priest spoke with the people in the plains of Moab by the Jordan at Jericho, saying, ⁴ “A census of the people shall be taken from twenty years old and upward, just as the Lord has commanded Moses.”

Now the Israelites who came out of the land of Egypt were:

⁵ Reuben, the firstborn of Israel (Jacob), the sons of Reuben: of Hanoch, the family of the Hanochites; of Pallu, the family of the Palluites;