Joshua 4:21-23

He told the Israelites, “In time to come, when children ask their fathers, ‘Why are these stones so important?’ tell them, ‘Here is the place where the Israelites crossed the Jordan on dry ground!’ For your God, YAHWEH, dried up the waters of the Jordan before your eyes until you crossed over, just as YAHWEH your God did for us years ago; he dried up the Red Sea while we crossed over!