Numbers 4:14

4:14 Then they must place on it all its implements with which they serve there – the trays, the meat forks, the shovels, the basins, and all the utensils of the altar – and they must spread on it a covering of fine leather, and then insert its poles.

Numbers 16:38

16:38 As for the censers of these men who sinned at the cost of their lives, they must be made into hammered sheets for covering the altar, because they presented them before the Lord and sanctified them. They will become a sign to the Israelites.”