Numbers 26:8

Reuben, the firstborn of Israel; the sons of Reuben: of Hanoch, 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 those who were counted of them were forty-three thousand seven hundred thirty.

The sons of Eliab: Nemuel, Dathan, and Abiram. These are that Dathan and Abiram who were called by the congregation, who rebelled against Moses and against Aaron in the company of Korah when they rebelled against the LORD;

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

Notwithstanding, the sons of Korah didn’t die.