Joshua 3:3-5

and gave orders to the people: “When you see the priests and Levites carrying the Ark of the Agreement with the LORD your God, leave where you are and follow it. That way you will know which way to go since you have never been here before. But do not follow too closely. Stay about a thousand yards behind the Ark.” Then Joshua told the people, “Make yourselves holy, because tomorrow the LORD will do amazing things among you.”