Numbers 26:4-6 New Revised Standard Version (NRSV)
4 “Take a census of the people,[a] from twenty years old and upward,” as the Lord commanded Moses.
The Israelites, who came out of the land of Egypt, were:
5 Reuben, the firstborn of Israel. The descendants of Reuben: of Hanoch, the clan of the Hanochites; of Pallu, the clan of the Palluites; 6 of Hezron, the clan of the Hezronites; of Carmi, the clan of the Carmites.