Numbers 4:10-12

10and they shall put it and all its utensils in a covering of fine leather, and put it on the carrying 1bars.

11Over the golden altar they shall spread a violet cloth, and cover it with a covering of fine leather, and they shall insert its carrying poles;

12and 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 2bars.