1 Samuel 6:6
Why then do you harden your hearts, as the Egyptians and Pharaoh hardened their hearts? when he had worked wonderfully among them, did they not let the people go, and they departed?
Exodus 7:13
And he hardened Pharaoh's heart, that he hearkened not unto them; as the LORD had said.
Exodus 8:15
But when Pharaoh saw that there was a respite, he hardened his heart, and hearkened not unto them; as the LORD had said.
Exodus 14:17
And I, behold, I will harden the hearts of the Egyptians, and they shall follow them: and I will get honor over Pharaoh, and over all his host, over his chariots, and over his horsemen.
Exodus 9:34
And when Pharaoh saw that the rain and the hail and the thunders were ceased, he sinned yet more, and hardened his heart, he and his servants.
Exodus 8:32
And Pharaoh hardened his heart at this time also, neither would he let the people go.
Exodus 9:16
And indeed for this very cause have I raised you up, to show in you my power; and that my name may be declared throughout all the earth.
Exodus 10:3
And Moses and Aaron came in unto Pharaoh, and said unto him, Thus says the LORD God of the Hebrews, How long will you refuse to humble yourself before me? let my people go, that they may serve me.
Exodus 12:31-33
And he called for Moses and Aaron by night, and said, Rise up, and go forth from among my people, both you and the children of Israel; and go, serve the LORD, as you have said.
Exodus 14:23
And the Egyptians pursued, and went in after them to the midst of the sea, even all Pharaoh's horses, his chariots, and his horsemen.
Exodus 15:14-16
The people shall hear, and be afraid: sorrow shall take hold on the inhabitants of Philistia.
Job 9:4
He is wise in heart, and mighty in strength: who has hardened himself against him, and has prospered?
Psalm 95:8
Harden not your heart, as in the provocation, and as in the day of trials in the wilderness:
Romans 2:5
But according to your hardness and unrepentant heart treasure up unto yourself wrath against the day of wrath and revelation of the righteous judgment of God;
Hebrews 3:13
But exhort one another daily, while it is called Today; lest any of you be hardened through the deceitfulness of sin.