Korah (son of Izhar), Dathan and Abiram (sons of Eliab), and On (son of Peleth) dared to challenge Moses. (Korah was a descendant of Kohath and Levi. Dathan, Abiram, and On were descendants of Reuben.)
You also saw what he did to Dathan and Abiram, the sons of Eliab, from the tribe of Reuben. In the middle of all the Israelites the ground opened up and swallowed them, their families, their tents, and every living creature with them.
How horrible it will be for them! They have followed the path of Cain. They have rushed into Balaam’s error to make a profit. They have rebelled like Korah and destroyed themselves.