Exodus 9:7
And Pharaoh sent, and behold, not one of the livestock of Israel was dead. But the heart of Pharaoh was hardened, and he did not let the people go.
Exodus 7:14
Then the LORD said to Moses, "Pharaoh's heart is hardened; he refuses to let the people go.
Exodus 8:32
But Pharaoh hardened his heart this time also, and did not let the people go.
Exodus 9:12
But the LORD hardened the heart of Pharaoh, and he did not listen to them, as the LORD had spoken to Moses.
Job 9:4
He is wise in heart and mighty in strength --who has hardened himself against him, and succeeded?--
Proverbs 29:1
He who is often reproved, yet stiffens his neck, will suddenly be broken beyond healing.
Isaiah 48:4
Because I know that you are obstinate, and your neck is an iron sinew and your forehead brass,
Daniel 5:20
But when his heart was lifted up and his spirit was hardened so that he dealt proudly, he was brought down from his kingly throne, and his glory was taken from him.
Romans 9:18
So then he has mercy on whomever he wills, and he hardens whomever he wills.