Exodus 14:4-5

4I will make Pharaoh so stubborn that he will pursue them. Then, because of what I do to Pharaoh and his entire army, I will receive honor, and the Egyptians will know that I am the Lord.” So that is what the Israelites did.

5When Pharaoh (the king of Egypt) was told that the people had fled, he and his officials changed their minds about them. They said, “What have we done? We’ve lost our slaves because we’ve let Israel go.”