Exodus 9:7
Pharaoh sent, and, behold, there was not so much as one of the livestock of the Israelites dead. But the heart of Pharaoh was stubborn, and he didn't let the people go.
Exodus 7:14
Yahweh said to Moses, "Pharaoh's heart is stubborn. He refuses to let the people go.
Exodus 8:32
Pharaoh hardened his heart this time also, and he didn't let the people go.
Exodus 9:12
Yahweh hardened the heart of Pharaoh, and he didn't listen to them, as Yahweh had spoken to Moses.
Job 9:4
God who is wise in heart, and mighty in strength: who has hardened himself against him, and prospered?
Proverbs 29:1
He who is often rebuked and stiffens his neck will be destroyed suddenly, with no remedy.
Isaiah 48:4
Because I knew that you are obstinate, and your neck is an iron sinew, and your brow brass;
Daniel 5:20
But when his heart was lifted up, and his spirit was hardened so that he dealt proudly, he was deposed from his kingly throne, and they took his glory from him:
Romans 9:18
So then, he has mercy on whom he desires, and he hardens whom he desires.