Joshua 4:20-24 ESV
And those twelve stones, which they took out of the Jordan, Joshua set up at Gilgal.
And he said to the people of Israel, When your children ask their fathers in times to come, What do these stones mean?
Then you shall let your children know, Israel passed over this Jordan on dry ground.
For the LORD your God dried up the waters of the Jordan for you until you passed over, as the LORD your God did to the Red Sea, which he dried up for us until we passed over,
So that all the peoples of the earth may know that the hand of the LORD is mighty, that you may fear the LORD your God forever.