Joshua 4:21-23

Then he spoke to the Israelites. He said, “In days to come, your children after you will ask their parents, ‘What do these stones mean?’ Their parents must tell them, ‘Israel went across the Jordan River on dry ground.’ The LORD your God dried up the Jordan for you until you had gone across it. He did to the Jordan River the same thing he had done to the Red Sea. He dried up the Red Sea ahead of us until we had gone across it.