Numbers 16:1-2

Now Korah, the son of Izhar, the son of Kohath, the son of Levi, with Dathan and Abiram, the sons of Eliab, and On, the son of Peleth, sons of Reuben, took some men. They rose up before Moses, with some of the children of Israel, two hundred and fifty princes of the congregation, called to the assembly, men of renown.