The stones with the Ten Commandments written on them were stored in the sacred chest, the place of mercy was put on top of it, and the carrying poles were attached.
When the camp is ready to be moved, the Kohathites will be responsible for carrying the sacred objects and the furnishings of the sacred tent. But Aaron and his sons must have already covered those things so the Kohathites won't touch them and die.
After I put the two stones in the sacred chest, the LORD chose the tribe of Levi, not only to carry the chest, but also to serve as his priests at the place of worship and to bless the other tribes in his name. And they still do these things.