Joshua 4:7-11

then you shall say to them, ‘That the waters of the Jordan were cut off before the ark of the covenant of the Lord; when it crossed the Jordan, the waters of the Jordan were cut off.’ So these stones shall become a memorial to the sons of Israel forever.”

So the sons of Israel did exactly as Joshua commanded, and took up twelve stones from the middle of the Jordan, just as the Lord spoke to Joshua, according to the number of the tribes of the sons of Israel; and they carried them over with them to the encampment and put them down there.

Then Joshua set up twelve stones in the middle of the Jordan at the place where the feet of the priests who carried the ark of the covenant were standing, and they are there to this day.

For the priests who carried the ark were standing in the middle of the Jordan until everything was completed that the Lord had commanded Joshua to speak to the people, according to all that Moses had commanded Joshua. And the people hurried and crossed;

and when all the people had finished crossing, then the ark of the Lord and the priests crossed in front of the people.