Exodus 4:21
The LORD instructed Moses, "When you go back to Egypt, see that you perform before Pharaoh all the wonders that I have put within your power. But I will harden his heart so that he will not let the people go.

Exodus 7:13, 14
Still, Pharaoh's heart was hardened, and he did not listen to them, just as the LORD had said. . . .

Exodus 9:12
But the LORD hardened Pharaoh's heart, and he would not listen to them, just as the LORD had told Moses.

Exodus 11:10
Moses and Aaron did all these wonders before Pharaoh, but the LORD hardened Pharaoh's heart so that he would not let the Israelites go out of his land.

Deuteronomy 2:30
But Sihon king of Heshbon would not let us pass through, for the LORD your God had made his spirit stubborn and his heart obstinate, that He might give him into your hands, as is the case this day.

Isaiah 6:9, 10
And He replied, "Go and tell this people: 'Be ever hearing, but never understanding; be ever seeing, but never perceiving.' . . .

John 12:39, 40
For this reason they were unable to believe. For again, Isaiah says: . . .

Romans 9:18
Therefore God has mercy on whom He wants to have mercy, and He hardens whom He wants to harden.

2 Thessalonians 2:11, 12
For this reason, God will send them a powerful delusion so that they will believe the lie, . . .