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 Pallu, the son of Reuben, made themselves ready, And came before Moses, with certain of the children of Israel, two hundred and fifty chiefs of the people, men of good name who had a place in the meeting of the people.