Joshua 11:20

For it was the LORD's doing to harden their hearts that they should come against Israel in battle, in order that they should be devoted to destruction and should receive no mercy but be destroyed, just as the LORD commanded Moses.

Deuteronomy 20:16-17

But in the cities of these peoples that the LORD your God is giving you for an inheritance, you shall save alive nothing that breathes,

Exodus 4:21

And the LORD said to Moses, "When you go back to Egypt, see that you do before Pharaoh all the miracles that I have put in your power. But I will harden his heart, so that he will not let the people go.

Deuteronomy 7:16

And you shall consume all the peoples that the LORD your God will give over to you. Your eye shall not pity them, neither shall you serve their gods, for that would be a snare to you.

Romans 9:18

So then he has mercy on whomever he wills, and he hardens whomever he wills.

Exodus 9:16

But for this purpose I have raised you up, to show you my power, so that my name may be proclaimed in all the earth.

Exodus 14:17

And I will harden the hearts of the Egyptians so that they shall go in after them, and I will get glory over Pharaoh and all his host, his chariots, and his horsemen.

Deuteronomy 2:30

But Sihon the king of Heshbon would not let us pass by him, for the LORD your God hardened his spirit and made his heart obstinate, that he might give him into your hand, as he is this day.

Joshua 11:12-15

And all the cities of those kings, and all their kings, Joshua captured, and struck them with the edge of the sword, devoting them to destruction, just as Moses the servant of the LORD had commanded.

Judges 14:4

His father and mother did not know that it was from the LORD, for he was seeking an opportunity against the Philistines. At that time the Philistines ruled over Israel.

1 Samuel 2:25

If someone sins against a man, God will mediate for him, but if someone sins against the LORD, who can intercede for him?" But they would not listen to the voice of their father, for it was the will of the LORD to put them to death.

1 Kings 12:15

So the king did not listen to the people, for it was a turn of affairs brought about by the LORD that he might fulfill his word, which the LORD spoke by Ahijah the Shilonite to Jeroboam the son of Nebat.

1 Kings 22:20-23

and the LORD said, 'Who will entice Ahab, that he may go up and fall at Ramoth-gilead?' And one said one thing, and another said another.

2 Chronicles 25:16

But as he was speaking, the king said to him, "Have we made you a royal counselor? Stop! Why should you be struck down?" So the prophet stopped, but said, "I know that God has determined to destroy you, because you have done this and have not listened to my counsel."

Isaiah 6:9-10

And he said, "Go, and say to this people: "'Keep on hearing, but do not understand; keep on seeing, but do not perceive.'

Romans 9:22-23

What if God, desiring to show his wrath and to make known his power, has endured with much patience vessels of wrath prepared for destruction,

Treasury of Scripture Knowledge

Summary

For it was of the LORD to harden their hearts, that they should come against Israel in battle, that he might destroy them utterly, and that they might have no favour, but that he might destroy them, as the LORD commanded Moses.

Bible References

It was

Exodus 4:21
And the LORD said to Moses, "When you go back to Egypt, see that you do before Pharaoh all the miracles that I have put in your power. But I will harden his heart, so that he will not let the people go.
Exodus 9:16
But for this purpose I have raised you up, to show you my power, so that my name may be proclaimed in all the earth.
Deuteronomy 2:30
But Sihon the king of Heshbon would not let us pass by him, for the LORD your God hardened his spirit and made his heart obstinate, that he might give him into your hand, as he is this day.
Judges 14:4
His father and mother did not know that it was from the LORD, for he was seeking an opportunity against the Philistines. At that time the Philistines ruled over Israel.
1 Samuel 2:25
If someone sins against a man, God will mediate for him, but if someone sins against the LORD, who can intercede for him?" But they would not listen to the voice of their father, for it was the will of the LORD to put them to death.
1 Kings 12:15
So the king did not listen to the people, for it was a turn of affairs brought about by the LORD that he might fulfill his word, which the LORD spoke by Ahijah the Shilonite to Jeroboam the son of Nebat.
1 Kings 22:20
and the LORD said, 'Who will entice Ahab, that he may go up and fall at Ramoth-gilead?' And one said one thing, and another said another.
2 Chronicles 25:16
But as he was speaking, the king said to him, "Have we made you a royal counselor? Stop! Why should you be struck down?" So the prophet stopped, but said, "I know that God has determined to destroy you, because you have done this and have not listened to my counsel."
Isaiah 6:9
And he said, "Go, and say to this people: "'Keep on hearing, but do not understand; keep on seeing, but do not perceive.'
Romans 9:18
So then he has mercy on whomever he wills, and he hardens whomever he wills.

As the lord

Joshua 11:12
And all the cities of those kings, and all their kings, Joshua captured, and struck them with the edge of the sword, devoting them to destruction, just as Moses the servant of the LORD had commanded.
Deuteronomy 20:16
But in the cities of these peoples that the LORD your God is giving you for an inheritance, you shall save alive nothing that breathes,

The Holy Bible, English Standard Version® copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.