Exodus 11:9
And Jehovah said to Moses, Pharaoh shall not listen to you, so that My wonders may be multiplied in the land of Egypt.
Exodus 7:3-4
And I will harden Pharaoh's heart and multiply My signs and My wonders in the land of Egypt.
Exodus 3:19
And I am sure that the king of Egypt will not let you go, no, not by a mighty hand.
Exodus 10:1
And Jehovah said to Moses, Go in to Pharaoh, for I have hardened his heart and the heart of his servants, so that I might show these My signs before him,
Romans 9:16-18
So then it is not of the one willing, nor of the one running, but of God, the One showing mercy.