Numbers 16:16-18

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

Korah, Be thou and all thy company before the Lord - i:e., at "the door of the tabernacle" (Numbers 16:18), that the assembled people might witness the experiment, and be properly impressed by the issue.

Two hundred and fifty censers - probably the small platters common in Egyptian families where incense was offered to household deities, and which had been among the precious things borrowed at their departure.