Numbers 4:12-14

and they shall take all the utensils of service, with which they serve in the sanctuary, and put them in a violet cloth and cover them with a covering of fine leather, and put them on the carrying bars. Then they shall clean away the ashes from the altar, and spread a purple cloth over it. They shall also put on it all its utensils by which they serve in connection with it: the firepans, the forks, shovels, and the basins, all the utensils of the altar; and they shall spread a cover of fine leather over it and insert its carrying poles.