Numbers 26:9-11

Young's Literal Translation

⁹ and the sons of Eliab [are] Nemuel and Dathan and Abiram; this [is that] Dathan and Abiram, called ones of the company, who have striven against Moses and against Aaron in the company of Korah, in their striving against Jehovah,

¹⁰ and the earth openeth her mouth, and swalloweth them and Korah, in the death of the company, in the fire consuming the two hundred and fifty men, and they become a sign;

¹¹ and the sons of Korah died not.