Charles Ellicott Commentary Numbers 16:3

"and they assembled themselves together against Moses and against Aaron, and said unto them, Ye take too much upon you, seeing all the congregation are holy, every one of them, and Jehovah is among them: wherefore then lift ye up yourselves above the assembly of Jehovah?" — Numbers 16:3 (ASV)

Ye take too much upon you ... —Or, enough for you , i.e., you have held the priesthood and the government long enough; or, Let it be enough for you to be numbered among the holy people without usurping dominion over them. It is evident from the whole tenor of the address that Korah laid claim to a universal priesthood on behalf of the people, designing probably to secure the chief place in that priesthood for himself.