Joshua 3:4

4However, there shall be a distance between you and it of about 2,000 cubits (3,000 ft.) by measurement. Do not come near it, 3:4 The implication is that coming too close to the ark would invite the divine punishment of death, and that the people can only follow the ark if they keep a safe distance.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.”