Numbers 16:39-40

39So Eleazar the priest collected the 250 bronze incense burners that had been used by the men who died in the fire, and the bronze was hammered into a thin sheet to overlay the altar.

40This would warn the Israelites that no unauthorized person—no one who was not a descendant of Aaron—should ever enter the Lord’s presence to burn incense. If anyone did, the same thing would happen to him as happened to Korah and his followers. So the Lord’s instructions to Moses were carried out.