Numbers 26:3-7

And Moses and Eleazar the priest spake with them in the plains of Moab by Jordan near Jericho, saying,

Take the sum of the people, from twenty years old and upward; as the LORD commanded Moses and the children of Israel, which went forth out of the land of Egypt.

Reuben, the eldest son of Israel: the children of Reuben; Hanoch, of whom cometh the family of the Hanochites: of Pallu, the family of the Palluites:

Of Hezron, the family of the Hezronites: of Carmi, the family of the Carmites.

These are the families of the Reubenites: and they that were numbered of them were forty and three thousand and seven hundred and thirty.