Numbers 16:1-2

Korah was the son of Izhar, the son of Kohath. Kohath was the son of Levi. Korah and certain men from the tribe of Reuben turned against Moses. The men from Reuben were Dathan, Abiram and On. Dathan and Abiram were the sons of Eliab. On was the son of Peleth. All those men rose up against Moses. And 250 men of Israel joined them. All of them were known as leaders in the community. They had been appointed as members of the ruling body.