Numbers 26:6 (KJV)

And it came to pass after the plague, that the LORD spake unto Moses and unto Eleazar the son of Aaron the priest, saying,

Take the sum of all the congregation of the children of Israel, from twenty years old and upward, throughout their fathers' house, all that are able to go to war in Israel.

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:

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

And the sons of Pallu; Eliab.

And the sons of Eliab; Nemuel, and Dathan, and Abiram. This is that Dathan and Abiram, which were famous in the congregation, who strove against Moses and against Aaron in the company of Korah, when they strove against the LORD:

And the earth opened her mouth, and swallowed them up together with Korah, when that company died, what time the fire devoured two hundred and fifty men: and they became a sign.

Notwithstanding the children of Korah died not.