Numbers 16:36-38, 39-40

GOD spoke to Moses: “Tell Eleazar son of Aaron the priest, Gather up the censers from the smoldering cinders and scatter the coals a distance away for these censers have become holy. Take the censers of the men who have sinned and are now dead and hammer them into thin sheets for covering the Altar. They have been offered to GOD and are holy to GOD. Let them serve as a sign to Israel, evidence of what happened this day.”

So Eleazar gathered all the bronze censers that belonged to those who had been burned up and had them hammered flat and used to overlay the Altar, just as GOD had instructed him by Moses. This was to serve as a sign to Israel that only descendants of Aaron were allowed to burn incense before GOD; anyone else trying it would end up like Korah and his gang.