Numbers 16:38, 40

even the censers of these sinners against their own lives; and let them be made beaten plates for a covering of the altar: for they offered them before Jehovah; therefore they are holy; and they shall be a sign unto the children of Israel.

to be a memorial unto the children of Israel, to the end that no stranger, that is not of the seed of Aaron, come near to burn incense before Jehovah; that he be not as Korah, and as his company: as Jehovah spake unto him by Moses.