The Bible talks about 2 exodus's. One the where the children of Israel leave Egypt and one at the end of the ages when the childeen of Israel (every tribe and tongue) leave every country of the world. The 2nd one will be so great that the Bible says Israel will no longer talk about the Exodus from Egypt. So think about what happened in the first Exodus that leed up to the people of God leaving Egypt because the 2nd one will mirror the first.