Exodus 14:17-18

17This is what I, the Lord, will do: I will cause the minds of the Egyptians to become hard. They will follow the Israelites into the sea to catch them. I will show how great I am when I win against Pharaoh and all his army, his chariots, his horses and their riders.

18When I do that, the Egyptians will know that I really am the Lord. They will know that I am great.’