Joshua 4:20-23

And those twelve stones which they had taken from the Jordan, Joshua set up in Gilgal. He said to the sons of Israel, “When your children ask their fathers in time to come, ‘What do these stones mean?’ then you shall let your children know, ‘Israel crossed this Jordan on dry ground.’ For the LORD your God dried up the waters of the Jordan for you until you crossed over, just as the LORD your God did to the Red Sea, which He dried up before us until we had crossed