John Gills Exposition of the Bible Commentary - Numbers 16:1
Now Korah, the son of Izhar, the son of Kohath, the son of Levi ,.... A great grandson of Levi's, and own cousin to Moses and Aaron, being brothers children; for Amram the father of Moses and Aaron, and Izhar the father of Korah, were own brothers, both of them the sons of Kohath, and Amram the eldest, and Izhar the next, Exodus 6:16 ; this man is mentioned first, being the contriver, and plotter, and ringleader of the following sedition, and which is called "the gainsaying of Core", ... read more
Matthew Henry's Complete Commentary - Numbers 16:1-11
Here is, I. An account of the rebels, who and what they were, not, as formerly, the mixed multitude and the dregs of the people, who are therefore never named, but men of distinction and quality, that made a figure. Korah was the ring-leader: he formed and headed the faction; therefore it is called the gainsaying of Korah, Jude 1:11. He was cousin-german to Moses, they were brothers? children, yet the nearness of the relation could not restrain him from being insolent and rude to Moses. Think... read more