Numbers 16:16-18

16And Moses said unto Korah, Be thou and all thy company before the Lord, thou, and they, and Aaron, to morrow:

17And take every man his censer, and put incense in them, and bring ye before the Lord every man his censer, two hundred and fifty censers; thou also, and Aaron, each of you his censer.

18And they took every man his censer, and put fire in them, and laid incense thereon, and stood in the door of the tabernacle of the congregation with Moses and Aaron.