Exodus 9:7

And Pharaoh will send, and behold, from the cattle of Israel, there died not even one And the heart of Pharaoh will be heavy, and he sent not forth the people.

Exodus 7:14

And Jehovah will say to Moses, Pharaoh's heart was heavy; he refused to send forth the people.

Exodus 8:32

And Pharaoh will make his heart heavy also in this time; he sent not forth the people.

Exodus 9:12

And Jehovah will bind fast the heart of Pharaoh, and he heard not to them: as Jehovah spake to Moses.

Job 9:4

Wise of heart and strong of power: who was hard before him and shall be requited?

Proverbs 29:1

A Man of reproofs hardening the neck, shall be suddenly broken, and no healing.

Isaiah 48:4

From my knowledge that thou wert hard, and thy neck an iron sinew, and thy forehead of brass:

Daniel 5:20

And when his heart was lifted up, and his spirit was strong for pride, he was brought down from the throne of his kingdom, and they took away his honor from him.

Romans 9:18

Surely then, whom he will he commiserates, and whom he will he hardens.

Treasury of Scripture Knowledge

Summary

And Pharaoh sent, and, behold, there was not one of the cattle of the Israelites dead. And the heart of Pharaoh was hardened, and he did not let the people go.

Bible References

The heart

Exodus 9:12
And Jehovah will bind fast the heart of Pharaoh, and he heard not to them: as Jehovah spake to Moses.
Exodus 7:14
And Jehovah will say to Moses, Pharaoh's heart was heavy; he refused to send forth the people.
Exodus 8:32
And Pharaoh will make his heart heavy also in this time; he sent not forth the people.
Job 9:4
Wise of heart and strong of power: who was hard before him and shall be requited?
Proverbs 29:1
A Man of reproofs hardening the neck, shall be suddenly broken, and no healing.
Isaiah 48:4
From my knowledge that thou wert hard, and thy neck an iron sinew, and thy forehead of brass:
Daniel 5:20
And when his heart was lifted up, and his spirit was strong for pride, he was brought down from the throne of his kingdom, and they took away his honor from him.
Romans 9:18
Surely then, whom he will he commiserates, and whom he will he hardens.