Numbers 16:2-3

and they rose up [in rebellion] before Moses, together with some of the Israelites, two hundred and fifty leaders of the congregation chosen in the assembly, men of distinction. They assembled together against Moses and Aaron, and said to them, “You have gone far enough, for all the congregation are holy, every one of them, and the LORD is among them. Why then do you exalt yourselves above the assembly of the LORD?”