Exodus 5:2

And Pharaoh said, Who is the Lord that I should obey His voice to let Israel go? I know not the Lord, neither will I let Israel go. Although Pharaoh's answer was given with the understanding that the gods governed the countries, and that therefore the Israelites belonged under the jurisdiction of the Egyptian gods and had no business to have a God of their own, Pharaoh here showed an impious, selfish, blasphemous mind, and proved himself a religious tyrant.