Numbers 16:39-40

So Eleazar the priest took the brass vessels which had been offered by those who were burned up, and they were hammered out to make a cover for the altar: To be a sign, kept in memory for ever by the children of Israel, that no man who is not of the seed of Aaron has the right of burning spices before the Lord, so that he may not be like Korah and his band: as the Lord said to him by the mouth of Moses.