Exodus 14:3-4

3Then Pharaoh will think, “The Israelites are confused. They do not know where they are going. The desert has stopped them.”

4Then I will cause Pharaoh's mind to become hard again. He will go to catch the Israelites. I will show how great I am when I win against Pharaoh and his whole army. Because of this, the Egyptians will know that I am the Lord.’ The Israelites did what God said.