Joshua 4:21-23

He said to the Israelite people, ‘In future years, your children will ask you, “What do these stones mean?” Then you must tell them, “We Israelites went across the Jordan River on dry ground.” Yes, you have seen what the LORD your God has done. He made the Jordan River become dry, so that you could cross over it. That was like he did to the Red Sea, so that we could cross it when we left Egypt.