Numbers 16:29-33
If these men die a natural death, or if they suffer the fate of all men, then the LORD has not sent me. . . .

Numbers 26:10
And the earth opened its mouth and swallowed them along with Korah, whose followers died when the fire consumed 250 men. They serve as a warning sign.

Deuteronomy 11:6
and what He did in the midst of all the Israelites to Dathan and Abiram, the sons of Eliab the Reubenite, when the earth opened its mouth and swallowed them, their households, their tents, and every living thing that belonged to them.