Exodus 5:2
2 But Pharaoh said, u“Who is the Lord, that I should obey his voice and let Israel go? I do not know the Lord, and moreover, vI will not let Israel go.”
Exodus 7:4
4 Pharaoh will not listen to you. Then I will lay my hand on Egypt and bring my hosts, my people the children of Israel, out of the land of Egypt by great acts of judgment.