Exodus 11:9
And the LORD said unto Moses, "Pharaoh shall not regard you, that many wonders may be wrought in the land of Egypt."
Exodus 7:3-4
But I will harden Pharaoh's heart, that I may multiply my miracles and my wonders in the land of Egypt.
Exodus 3:19
Notwithstanding, I am sure that the king of Egypt will not let you go, except it be with a mighty hand:
Exodus 10:1
The LORD said unto Moses, "Go unto Pharaoh; nevertheless I have hardened his heart and the hearts of his servants, that I might show these, my signs, amongst them,
Romans 9:16-18
So lieth it not then in a man's will, or cunning, but in the mercy of God.