Numbers 16:39-40

39So the priest Eleazar took the bronze incense burners which had been brought by those who had been burned to death. The incense burners were then hammered into thin metal sheets to cover the altar,

40following the command that the Lord had given through Moses. The bronze-covered altar will remind Israel that no one but a descendant of Aaron can come near to burn incense to the Lord. Everyone else will die like Korah and his followers.