Joshua 4:21-23

And he spoke unto the sons of Israel, saying, When your children shall ask their fathers in time to come, saying, What do these stones mean unto you? Then ye shall let your children know, saying, Israel came over this Jordan on dry land. For the LORD your God dried up the waters of the Jordan from before you until ye had passed, as the your God dried up the waters of the Jordan from before you until ye had passed, as the LORD your God did to the Red Sea, which he dried up from before us until we had passed