Num Numbers, chapter Book of Numbers, chapter 16
Korah, 16:1. Korah was a cousin of Moses and Aaron, and jealousy of their position may have been behind his rebellion. son of Izhar, son of Kohath, son of Levi tried to take over leadership, along with Dathan and Abiram, sons of Eliab, and On, son of Peleth, who were from the tribe of Reuben. Num 27:3; Exo 6:21