Joshua 11:20

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 mercy, but that he might destroy them, as the LORD had commanded Moses.

Deuteronomy 20:16-17

Only of the cities of these peoples, which the LORD thy God gives thee for an inheritance, thou shalt save alive nothing that breathes;

Exodus 4:21

And the LORD said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand; but I will harden his heart, that he shall not let the people go.

Deuteronomy 7:16

And thou shalt consume all the peoples which the LORD thy God shall deliver thee; thine eye shall have no pity upon them; neither shalt thou serve their gods; for that will be a snare unto thee.

Romans 9:18

Therefore he has mercy on whom he will have mercy, and he hardens whom he will.

Exodus 9:16

For in truth I have placed thee to declare my power in thee, and that my name may be declared throughout all the earth.

Exodus 14:17

And behold, I will harden the hearts of the Egyptians that they shall follow them: and I will be glorified in Pharaoh and in all his host, in his chariots, and in his horsemen.

Deuteronomy 2:30

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

Joshua 11:12-15

Likewise, Joshua took all the cities of those kings and all their kings and smote them with the edge of the sword, and he utterly destroyed them as Moses the slave of the LORD had commanded him.

Judges 14:4

But his father and his mother did not know that it was of the LORD that he sought an occasion against the Philistines, for at that time the Philistines had dominion over Israel.

1 Samuel 2:25

If one man sins against another, the judges shall judge him, but if someone sins against the LORD, who shall intreat for him? Notwithstanding they did not hearken unto the voice of their father because the LORD had already decided to kill them.

1 Kings 12:15

Therefore, the king did not hearken unto the people, for the cause was from the LORD, to confirm his word, which the LORD spoke by Ahijah the Shilonite unto Jeroboam, the son of Nebat.

1 Kings 22:20-23

And the LORD said, Who shall persuade Ahab that he may go up and fall at Ramothgilead? And one said in this manner and another said in that manner.

2 Chronicles 25:16

And as the prophet was speaking these things unto him, he said unto him, Art thou appointed as the king's counsel? Forbear; why should thou be smitten? Then the prophet forbare and said, I know that God has determined to destroy thee because thou hast done this and hast not hearkened unto my counsel.

Isaiah 6:9-10

Then he said, Go and tell this people, Hear indeed, but do not understand; and see indeed, but do not perceive.

Romans 9:22-23

What if God, desiring to show his wrath and to make his power known, endured with much meekness the vessels of wrath, prepared for death,

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 unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand; but I will harden his heart, that he shall not let the people go.
Exodus 9:16
For in truth I have placed thee to declare my power in thee, 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 the LORD thy God had hardened his spirit and made his heart obstinate that he might deliver him into thy hand as until this day.
Judges 14:4
But his father and his mother did not know that it was of the LORD that he sought an occasion against the Philistines, for at that time the Philistines had dominion over Israel.
1 Samuel 2:25
If one man sins against another, the judges shall judge him, but if someone sins against the LORD, who shall intreat for him? Notwithstanding they did not hearken unto the voice of their father because the LORD had already decided to kill them.
1 Kings 12:15
Therefore, the king did not hearken unto the people, for the cause was from the LORD, to confirm his word, which the LORD spoke by Ahijah the Shilonite unto Jeroboam, the son of Nebat.
1 Kings 22:20
And the LORD said, Who shall persuade Ahab that he may go up and fall at Ramothgilead? And one said in this manner and another said in that manner.
2 Chronicles 25:16
And as the prophet was speaking these things unto him, he said unto him, Art thou appointed as the king's counsel? Forbear; why should thou be smitten? Then the prophet forbare and said, I know that God has determined to destroy thee because thou hast done this and hast not hearkened unto my counsel.
Isaiah 6:9
Then he said, Go and tell this people, Hear indeed, but do not understand; and see indeed, but do not perceive.
Romans 9:18
Therefore he has mercy on whom he will have mercy, and he hardens whom he will.

As the lord

Joshua 11:12
Likewise, Joshua took all the cities of those kings and all their kings and smote them with the edge of the sword, and he utterly destroyed them as Moses the slave of the LORD had commanded him.
Deuteronomy 20:16
Only of the cities of these peoples, which the LORD thy God gives thee for an inheritance, thou shalt save alive nothing that breathes;