Numbers 4:5-6, 15

When the camp moves, Aaron and his sons must enter the Tabernacle first to take down the inner curtain and cover the Ark of the Covenant with it. Then they must cover the inner curtain with fine goatskin leather and spread over that a single piece of blue cloth. Finally, they must put the carrying poles of the Ark in place.

The camp will be ready to move when Aaron and his sons have finished covering the sanctuary and all the sacred articles. The Kohathites will come and carry these things to the next destination. But they must not touch the sacred objects, or they will die. So these are the things from the Tabernacle that the Kohathites must carry.