Numbers 16:37-38

37Tell Eleazar the son of Aaron the priest to take up the censers out of the blaze. Then scatter the fire far and wide, for they have become holy. 38As for the censers of athese men who have sinned at the cost of their lives, let them be made into hammered plates as a covering for the altar, for they offered them before the Lord, and they became holy. bThus they shall be a sign to the people of Israel.”
Copyright information for ESV