Exodus 3:19

But Pharaoh said, “Who is Yahweh that I should listen to His voice to let Israel go? I do not know Yahweh, and also, I will not let Israel go.”

Then Yahweh said to Moses, “Now you shall see what I will do to Pharaoh; for by a strong hand he will let them go, and by a strong hand he will drive them out of his land.”

“But Pharaoh will not listen to you. And I will set My hand upon Egypt and bring out My hosts, My people the sons of Israel, from the land of Egypt by great judgments.