Numbers 16:39-40

39So Eleazar the priest took the bronze censers, which those who were burned had offered, and they were hammered out as a covering for the altar,

40to be a reminder to the people of Israel, so that no outsider, who is not of the descendants of Aaron, should draw near to burn incense before the Lord, lest he become like Korah and his company—as the Lord said to him through Moses.