Numbers 16:1-2

NOW KORAH son of Izhar, the son of Kohath, the son of Levi, with Dathan and Abiram sons of Eliab, and On son of Peleth, sons of Reuben, took men, And they rose up before Moses, with certain of the Israelites, 250 princes or leaders of the congregation called to the assembly, men well known and of distinction.