Exodus 8:32

And Pharaoh even hardened his heart this time and did not let the people go.

Exodus 8:15

But when Pharaoh saw that there was respite, he hardened his heart and did not hearken unto them as the LORD had said.

Exodus 4:21

And the LORD said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand; but I will harden his heart, that he shall not let the people go.

Exodus 7:13-14

And Pharaoh's heart became hard, that he hearkened not unto them as the LORD had said.

Exodus 8:8

Then Pharaoh called for Moses and Aaron and said unto them, Intreat the LORD that he may take away the frogs from me and from my people, and I will let the people go that they may sacrifice unto the LORD.

Isaiah 63:17

O LORD, why hast thou made us to err from thy ways? Hast thou hardened our heart to thy fear? Return for thy slaves, for the tribes of thine inheritance.

Acts 28:26-27

saying, Go unto this people, and say, Hearing ye shall hear and shall not understand; and seeing ye shall see and not perceive;

Romans 2:5

But after thy hardness and impenitent heart treasures up unto thyself wrath against 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 tempted of God; for God cannot be tempted with evil, neither does he 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 respite, he hardened his heart and did not hearken unto them as the LORD had said.
Exodus 4:21
And the LORD said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand; but I will harden his heart, that he shall not let the people go.
Exodus 7:13
And Pharaoh's heart became hard, that he hearkened not unto them as the LORD had said.
Isaiah 63:17
O LORD, why hast thou made us to err from thy ways? Hast thou hardened our heart to thy fear? Return for thy slaves, for the tribes of thine inheritance.
Acts 28:26
saying, Go unto this people, and say, Hearing ye shall hear and shall not understand; and seeing ye shall see and not perceive;
Romans 2:5
But after thy hardness and impenitent heart treasures up unto thyself wrath against 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 tempted of God; for God cannot be tempted with evil, neither does he tempt anyone: