Numbers 26:9-10

⁹And the sons of Eliab: Nemuel, and Dathan, and Abiram. These are Dathan and Abiram, men called to the assembly, who quarreled against Moses and against Aaron in the company of Korach, at the time they quarreled against the Lord;

¹⁰When the earth opened her mouth, and swallowed them up together with Korach, while that company died, when the fire devoured the two hundred and fifty men; and they became a sign.