Exodus 8:32

And Pharaoh made his heart dull, this time also, - and did not let the people go.

Exodus 8:15

But when Pharaoh saw that there had come a respite, then made he his heart dull and hearkened not unto them, - as spake Yahweh.

Exodus 4:21

And Yahweh said unto Moses, When thou goest to return to Egypt, see as touching all the wonders which I have put in thy hand, that thou do them before Pharaoh - but, I, will let his heart wax bold, and he will not suffer the people to go.

Exodus 7:13-14

Then waxed bold the heart of Pharaoh, and he hearkened not unto them, - as spake Yahweh.

Exodus 8:8

Then called Pharaoh for Moses and for Aaron and said - Make entreaty unto Yahweh, that he take away the frogs from me and from my people, - and I must lot the people go that they may sacrifice to Yahweh.

Isaiah 63:17

Wherefore shouldst thou suffer us to wander O Yahweh, from thy ways? Wherefore shouldst thou let us harden our heart past revering thee? Return thou for the sake of Thy servants, The tribes thou thyself hast inherited.

Acts 28:26-27

saying - Go thy way unto this people, and say - Ye shall, surely hear, and yet will in nowise understand. And, surely see, and yet will in nowise perceive;

Romans 2:5

But, according to thy hardness, and thine impenitent heart, art treasuring up for thyself anger, in a day of anger and revelation of the righteous judgment of God, -

James 1:13-14

Let, no one, while tempted, be saying - From God, am I tempted, - for, God, cannot be tempted by things evil, and, himself, tempteth no one;

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 had come a respite, then made he his heart dull and hearkened not unto them, - as spake Yahweh.
Exodus 4:21
And Yahweh said unto Moses, When thou goest to return to Egypt, see as touching all the wonders which I have put in thy hand, that thou do them before Pharaoh - but, I, will let his heart wax bold, and he will not suffer the people to go.
Exodus 7:13
Then waxed bold the heart of Pharaoh, and he hearkened not unto them, - as spake Yahweh.
Isaiah 63:17
Wherefore shouldst thou suffer us to wander O Yahweh, from thy ways? Wherefore shouldst thou let us harden our heart past revering thee? Return thou for the sake of Thy servants, The tribes thou thyself hast inherited.
Acts 28:26
saying - Go thy way unto this people, and say - Ye shall, surely hear, and yet will in nowise understand. And, surely see, and yet will in nowise perceive;
Romans 2:5
But, according to thy hardness, and thine impenitent heart, art treasuring up for thyself anger, in a day of anger and revelation of the righteous judgment of God, -
James 1:13
Let, no one, while tempted, be saying - From God, am I tempted, - for, God, cannot be tempted by things evil, and, himself, tempteth no one;