Numbers 16:1-2

Now Korah son of Izhar, the son of Kohath, the son of Levi, and Dathan and Abiram, the sons of Eliab, and On son of Peleth, who were Reubenites, took men and rebelled against Moses, along with some of the Israelites, 250 leaders of the community, chosen from the assembly, famous men.