Numbers 4:10-12

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

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

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