Joshua 4:21-23

And he spoke to the children of Israel, saying, When your children hereafter ask their fathers, saying, What mean these stones? then ye shall let your children know, saying, On dry land did Israel come over this Jordan; because Jehovah your God dried up the waters of the Jordan from before you, until ye had passed over, as Jehovah your God did to the Red sea, which he dried up from before us, until we had passed over