Exodus 7:14

Then the LORD said unto Moses, Pharaoh's heart is become grievous, for he refuses to 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 10:1

And the LORD said unto Moses, Go in unto Pharaoh for I have hardened his heart and the heart of his slaves that I might show these my signs among them

Exodus 10:20

But the LORD hardened Pharaoh's heart, so that he would not let the sons of Israel go.

Exodus 10:27

But the LORD hardened Pharaoh's heart, and he would not let them go.

Exodus 4:23

And I have said unto thee, Let my son go that he may serve me, but thou hast refused to let him go; therefore, behold, I will slay thy son, even thy firstborn.

Exodus 8:2

And if thou refuse to let them go, behold, I will smite all thy borders with frogs:

Exodus 9:2

For if thou refuse to let them go and wilt hold them still,

Exodus 10:4

For if thou refuse to let my people go, behold, tomorrow I will bring the locusts into thy borders,

Isaiah 1:20

But if ye refuse and rebel, ye shall be devoured with the sword; for the mouth of the LORD has spoken it.

Jeremiah 8:5

Why then is this people of Jerusalem rebellious with a perpetual rebellion? They hold fast deceit; they refuse to return.

Jeremiah 9:6

Thine habitation is in the midst of deceit; through deceit they refuse to know me, saith the LORD.

Zechariah 7:12

Yea, they made their hearts as an adamant stone lest they should hear the law and the words which the LORD of the hosts has sent by his Spirit by the hand of the former prophets; therefore came great wrath from the LORD of the hosts.

Hebrews 12:25

See that you do not refuse him that speaks. For if those who refused him that spoke on earth did not escape, much less shall we escape, if we turn away from him that speaks from the heavens,

Treasury of Scripture Knowledge

Summary

And the LORD said unto Moses, Pharaoh's heart is hardened, he refuseth to let the people go.

General references

Bible References

Pharaoh's

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 10:1
And the LORD said unto Moses, Go in unto Pharaoh for I have hardened his heart and the heart of his slaves that I might show these my signs among them
Zechariah 7:12
Yea, they made their hearts as an adamant stone lest they should hear the law and the words which the LORD of the hosts has sent by his Spirit by the hand of the former prophets; therefore came great wrath from the LORD of the hosts.

He refuseth

Exodus 4:23
And I have said unto thee, Let my son go that he may serve me, but thou hast refused to let him go; therefore, behold, I will slay thy son, even thy firstborn.
Exodus 8:2
And if thou refuse to let them go, behold, I will smite all thy borders with frogs:
Exodus 9:2
For if thou refuse to let them go and wilt hold them still,
Exodus 10:4
For if thou refuse to let my people go, behold, tomorrow I will bring the locusts into thy borders,
Isaiah 1:20
But if ye refuse and rebel, ye shall be devoured with the sword; for the mouth of the LORD has spoken it.
Jeremiah 8:5
Why then is this people of Jerusalem rebellious with a perpetual rebellion? They hold fast deceit; they refuse to return.
Jeremiah 9:6
Thine habitation is in the midst of deceit; through deceit they refuse to know me, saith the LORD.
Hebrews 12:25
See that you do not refuse him that speaks. For if those who refused him that spoke on earth did not escape, much less shall we escape, if we turn away from him that speaks from the heavens,

General references

Exodus 8:32
And Pharaoh even hardened his heart this time and did not let the people go.
Exodus 9:12
And the LORD hardened the heart of Pharaoh, and he did hearken unto them as the LORD had spoken unto Moses.
Exodus 10:20
But the LORD hardened Pharaoh's heart, so that he would not let the sons of Israel go.