Numbers 16:2-6

and they stood before Moses, together with some of the sons of Israel, 250 leaders of the congregation chosen in the assembly, men of renown.

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 in their midst; so why do you exalt yourselves above the assembly of the Lord?”

When Moses heard this, he fell on his face;

and he spoke to Korah and all his group, saying, “Tomorrow morning the Lord will make known who is His, and who is holy, and will bring that one near to Himself; indeed, the one whom He will choose, He will bring near to Himself.

Do this: take censers for yourselves, Korah and your whole group,