Joshua 3:4-5

However, there shall be a distance between you and it of about 2,000 cubits (3,000 ft.) by measurement. Do not come near it, so that you may [be able to see the ark and] know the way you are to go, for you have not passed this way before.” Then Joshua said to the people, “Sanctify yourselves [for His purpose], for tomorrow the LORD will do wonders (miracles) among you.”