Joshua 11:20

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

Deuteronomy 20:16-17

But of the cities of these peoples, that Yahweh your God gives you for an inheritance, you shall save alive nothing that breathes;

Exodus 4:21

Yahweh said to Moses, "When you go back into Egypt, see that you do before Pharaoh all the wonders which I have put in your hand, but I will harden his heart and he will not let the people go.

Deuteronomy 7:16

You shall consume all the peoples whom Yahweh your God shall deliver to you; your eye shall not pity them: neither shall you serve their gods; for that will be a snare to you.

Romans 9:18

So then, he has mercy on whom he desires, and he hardens whom he desires.

Exodus 9:16

but indeed for this cause I have made you stand: to show you my power, and that my name may be declared throughout all the earth;

Exodus 14:17

I, behold, I will harden the hearts of the Egyptians, and they shall go in after them: and I will get myself honor over Pharaoh, and over all his armies, over his chariots, and over his horsemen.

Deuteronomy 2:30

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

Joshua 11:12-15

Joshua captured all the cities of those kings, with their kings, and he struck them with the edge of the sword, and utterly destroyed them; as Moses the servant of Yahweh commanded.

Judges 14:4

But his father and his mother didn't know that it was of Yahweh; for he sought an occasion against the Philistines. Now at that time the Philistines had rule over Israel.

1 Samuel 2:25

If one man sin against another, God shall judge him; but if a man sin against Yahweh, who shall entreat for him?" Notwithstanding, they didn't listen to the voice of their father, because Yahweh was minded to kill them.

1 Kings 12:15

So the king didn't listen to the people; for it was a thing brought about of Yahweh, that he might establish his word, which Yahweh spoke by Ahijah the Shilonite to Jeroboam the son of Nebat.

1 Kings 22:20-23

Yahweh said, 'Who shall entice Ahab, that he may go up and fall at Ramoth Gilead?' One said one thing; and another said another.

2 Chronicles 25:16

It happened, as he talked with him, that [the king] said to him, "Have we made you one of the king's counselors? Stop! Why should you be struck down?" Then the prophet stopped, and 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

He said, "Go, and tell this people, 'You hear indeed, but don't understand; and you see indeed, but don't perceive.'

Romans 9:22-23

What if God, willing to show his wrath, and to make his power known, endured with much patience vessels of wrath made 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
Yahweh said to Moses, "When you go back into Egypt, see that you do before Pharaoh all the wonders which I have put in your hand, but I will harden his heart and he will not let the people go.
Exodus 9:16
but indeed for this cause I have made you stand: to show you my power, and that my name may be declared throughout all the earth;
Deuteronomy 2:30
But Sihon king of Heshbon would not let us pass by him; for Yahweh your God hardened his spirit, and made his heart obstinate, that he might deliver him into your hand, as at this day.
Judges 14:4
But his father and his mother didn't know that it was of Yahweh; for he sought an occasion against the Philistines. Now at that time the Philistines had rule over Israel.
1 Samuel 2:25
If one man sin against another, God shall judge him; but if a man sin against Yahweh, who shall entreat for him?" Notwithstanding, they didn't listen to the voice of their father, because Yahweh was minded to kill them.
1 Kings 12:15
So the king didn't listen to the people; for it was a thing brought about of Yahweh, that he might establish his word, which Yahweh spoke by Ahijah the Shilonite to Jeroboam the son of Nebat.
1 Kings 22:20
Yahweh said, 'Who shall entice Ahab, that he may go up and fall at Ramoth Gilead?' One said one thing; and another said another.
2 Chronicles 25:16
It happened, as he talked with him, that [the king] said to him, "Have we made you one of the king's counselors? Stop! Why should you be struck down?" Then the prophet stopped, and 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
He said, "Go, and tell this people, 'You hear indeed, but don't understand; and you see indeed, but don't perceive.'
Romans 9:18
So then, he has mercy on whom he desires, and he hardens whom he desires.

As the lord

Joshua 11:12
Joshua captured all the cities of those kings, with their kings, and he struck them with the edge of the sword, and utterly destroyed them; as Moses the servant of Yahweh commanded.
Deuteronomy 20:16
But of the cities of these peoples, that Yahweh your God gives you for an inheritance, you shall save alive nothing that breathes;