Joshua 3:1-3

Then Joshua rose early in the morning; and he and all the sons of Israel set out from Shittim and came to the Jordan, and they lodged there before they crossed. At the end of three days the officers went through the midst of the camp; and they commanded the people, saying, “When you see the ark of the covenant of the LORD your God with the Levitical priests carrying it, then you shall set out from your place and go after it.