Joshua 3:2-4

2After three days the officers went through the camp

3and commanded the people, “When you see the ark of the covenant of the Lord your God carried by the Levitical priests, you are to break camp and follow it.

4But keep a distance of about a thousand yards between yourselves and the ark. Don’t go near it, so that you can see the way to go, for you haven’t traveled this way before.”