Joshua 4:18

And it came to pass, when the priests that bare the Ark of the Covenant of the Lord were come up out of the midst of Jordan, and the soles of the priests' feet were lifted up unto the dry land, literally, "tore themselves loose toward the dry land," said of leaving the bed of the stream and stepping upon the dry bank, that the waters of Jordan returned unto their place, flowed down stream in their natural course, and flowed over all his banks, as they did before. Thus it must have been plain to all the people that it had been the ark which had served as a dam to hold back the waters of the flooded river.