Exodus 9:7
Then Pharaoh inquired and discovered that not a single one of the livestock of Israel had died, but Pharaoh's heart was stubborn and he would not let the people go.
Exodus 7:14
Then the LORD told Moses, "Pharaoh's heart is hard. He has refused to let the people go.
Exodus 8:32
But this time also Pharaoh hardened his heart, and he did not let the people go.
Exodus 9:12
The LORD made Pharaoh's heart stubborn so that he would not listen to them, just as the LORD had told Moses.
Job 9:4
He is wise in heart and strong in will who can be stubborn against him and succeed?
Proverbs 29:1
After many rebukes, the stiff-necked man will be broken incurably, without any warning.
Isaiah 48:4
Because I knew that you are obstinate, and because your neck is an iron sinew, and your forehead is bronze,
Daniel 5:20
But when he became arrogant and his spirit hardened, he was removed from his royal throne and his glory was taken away from him.
Romans 9:18
Therefore, God has mercy on whomever he chooses, and he hardens the heart of whomever he chooses.