Numbers 16:37-38

37“Tell Eleazar son of Aaron the kohen, to take the censers from the burning, because they are holy, and scatter the coals at a distance.

38As for the censers of these men who sinned at the cost of their lives, let them be taken and hammered into sheets as a covering for the altar. For they were presented before Adonai, so they are holy. They are to be a sign to Bnei-Yisrael.”