Exodus 8:32

But Pharaoh hardened his heart this time also, and he did not let the people go.

Exodus 8:15

But when Pharaoh saw that there was relief, he hardened his heart and did not listen to them, as the Lord had said.

Exodus 4:21

The Lord said to Moses, “When you go back to Egypt see that you perform before Pharaoh all the wonders which I have put in your power; but I will harden his heart so that he will not let the people go.

Exodus 7:13-14

Yet Pharaoh’s heart was hardened, and he did not listen to them, as the Lord had said.

Exodus 8:8

Then Pharaoh called for Moses and Aaron and said, “Entreat the Lord that He remove the frogs from me and from my people; and I will let the people go, that they may sacrifice to the Lord.”

Isaiah 63:17

Why, O Lord, do You cause us to stray from Your ways
And harden our heart from fearing You?
Return for the sake of Your servants, the tribes of Your heritage.

Acts 28:26-27

saying,
Go to this people and say,
You will keep on hearing, but will not understand;
And you will keep on seeing, but will not perceive;

Romans 2:5

But because of your stubbornness and unrepentant heart you are storing up wrath for yourself in the day of wrath and revelation of the righteous judgment of God,

James 1:13-14

Let no one say when he is tempted, “I am being tempted by God”; for God cannot be tempted by evil, and He Himself does not tempt anyone.

Treasury of Scripture Knowledge

Summary

And Pharaoh hardened his heart at this time also, neither would he let the people go.

Bible References

General references

Exodus 8:15
But when Pharaoh saw that there was relief, he hardened his heart and did not listen to them, as the Lord had said.
Exodus 4:21
The Lord said to Moses, “When you go back to Egypt see that you perform before Pharaoh all the wonders which I have put in your power; but I will harden his heart so that he will not let the people go.
Exodus 7:13
Yet Pharaoh’s heart was hardened, and he did not listen to them, as the Lord had said.
Isaiah 63:17
Why, O Lord, do You cause us to stray from Your ways
And harden our heart from fearing You?
Return for the sake of Your servants, the tribes of Your heritage.
Acts 28:26
saying,
Go to this people and say,
You will keep on hearing, but will not understand;
And you will keep on seeing, but will not perceive;
Romans 2:5
But because of your stubbornness and unrepentant heart you are storing up wrath for yourself in the day of wrath and revelation of the righteous judgment of God,
James 1:13
Let no one say when he is tempted, “I am being tempted by God”; for God cannot be tempted by evil, and He Himself does not tempt anyone.