“Israel passed over this Jordan on dry ground” (v22). After God made a dry path for the Israelites through the Jordan River, they set up memorial stones so that they could tell the story to their children. Joshua reminded them that God had done the same for his generation at the Red Sea (v23), though he and Caleb were the only ones living who had experienced that miracle. This new supernatural act proved that God was still leading His people.
“So that all the peoples of the earth may know …” (v24). God wants every generation to know our salvation history and to experience a new river-crossing, so that we can keep testifying to the world of His redeeming love.