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.
Moses wrote down all these laws and teachings and gave them to the priests and the leaders of Israel. The priests were from the Levi tribe, and they carried the sacred chest that belonged to the LORD.
shouting, “When you see some of the priests carrying the sacred chest, you'll know it is time to cross to the other side. You've never been there before, and you won't know the way, unless you follow the chest. But don't get too close! Stay about a kilometre back.”
Then Joshua turned to the priests and said, “Take the chest and cross the River Jordan ahead of us.” So the priests picked up the chest by its carrying poles and went on ahead.
Joshua told some other men to set up a monument next to the place where the priests were standing. This monument was also made of twelve large rocks, and it is still there in the middle of the river.