Joshua 4:4-13

4Then Joshua called the twelve men, whom he had prepared of the children of Israel, of every tribe a man: 5And Joshua said to them, Pass over before the ark of the LORD your God into the midst of Jordan, and take ye up every man of you a stone upon his shoulder, according to the number of the tribes of the children of Israel: 6That this may be a sign among you, that when your children ask their fathers in time to come, saying, What mean ye by these stones?1 7Then ye shall answer them, That the waters of Jordan were cut off before the ark of the covenant of the LORD; when it passed over Jordan, the waters of Jordan were cut off: and these stones shall be for a memorial to the children of Israel for ever. 8And the children of Israel did so as Joshua commanded, and took up twelve stones from the midst of Jordan, as the LORD spoke Joshua, according to the number of the tribes of the children of Israel, and carried them over with them to the place where they lodged, and laid them down there. 9And Joshua set up twelve stones in the midst of Jordan, in the place where the feet of the priests who bore the ark of the covenant stood: and they are there to this day.

10For the priests who bore the ark stood in the midst of Jordan, until every thing was finished that the LORD commanded Joshua to speak to the people, according to all that Moses commanded Joshua: and the people hasted and passed over. 11And it came to pass, when all the people had finished crossing, that the ark of the LORD passed over, and the priests, in the presence of the people. 12And the children of Reuben, and the children of Gad, and half the tribe of Manasseh, passed over armed before the children of Israel, as Moses directed them: 13About forty thousand prepared for war passed over before the LORD to battle, to the plains of Jericho.2