Then he said, "Moses, go and warn the people not to cross the boundary that you set at the foot of the mountain. They must not cross it to come and look at me, because if they do, many of them will die.
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.