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4that you may know the way you shall go, for you have not passed this way before. Yet there shall be a space between you and it, a distance of about two thousand cubits; do not come near it." 5And Joshua said to the people, "Sanctify yourselves; for tomorrow the LORD will do wonders among you." 6And Joshua said to the priests, "Take up the ark of the covenant, and pass on before the people." And they took up the ark of the covenant, and went before the people.
Joshua 3:4-7 (RSV)