Numbers 16:38-40

38the censers of the men who sinned at the cost of their lives. Hammer the censers into sheets to overlay the altar, for they were presented before the Lord and have become holy. Let them be a sign to the Israelites.”

39So Eleazar the priest collected the bronze censers brought by those who had been burned to death, and he had them hammered out to overlay the altar,

40as the Lord directed him through Moses. This was to remind the Israelites that no one except a descendant of Aaron should come to burn incense before the Lord, or he would become like Korah and his followers.