John Calvin Reformed @genevareformer

1. Now Korah, the son of Izhar. The impious conspiracy is here related of a few men, but these of the highest rank, whose object was to subvert and destroy the divinely-appointed priesthood. They make their attack, indeed, upon Moses, and accuse him of ruling unjustly; for thus it is that turbulent persons are carried away without reason or discrimination; but, the only cause why...

Matthew Henry Presbyterian @wholebiblehenry

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, Jde 1:11.

Commenting on Numbers 16:1-11

John Gill Reformed Baptist @doctorgill

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, Exo 6:16; this man...