Numbers 4:10-12

10and they shall put it and all its utensils in a covering of porpoise skin, and shall put it on the carrying bars.

11Over the golden altar they shall spread a 1blue cloth and cover it with a covering of porpoise skin, and shall insert its poles;

12and they shall take all the utensils of service, with which they serve in the sanctuary, and put them in a 2blue cloth and cover them with a covering of porpoise skin, and put them on the carrying bars.