Joshua 11:20

for from Jehovah it hath been to strengthen their heart, to meet in battle with Israel, in order to devote them, so that they have no grace, but in order to destroy them, as Jehovah commanded Moses.

Deuteronomy 20:16-17

Only, of the cities of these peoples which Jehovah thy God is giving to thee for an inheritance, thou dost not keep alive any breathing;

Exodus 4:21

And Jehovah saith unto Moses, 'In thy going to turn back to Egypt, see -- all the wonders which I have put in thy hand -- that thou hast done them before Pharaoh, and I -- I strengthen his heart, and he doth not send the people away;

Deuteronomy 7:16

And thou hast consumed all the peoples whom Jehovah thy God is giving to thee; thine eye hath no pity on them, and thou dost not serve their gods, for a snare it is to thee.

Romans 9:18

so, then, to whom He willeth, He doth kindness, and to whom He willeth, He doth harden.

Exodus 9:16

'And yet for this I have caused thee to stand, so as to show thee My power, and for the sake of declaring My Name in all the earth;

Exodus 14:17

And I -- lo, I am strengthening the heart of the Egyptians, and they go in after them, and I am honoured on Pharaoh, and on all his force, on his chariots, and on his horsemen;

Deuteronomy 2:30

'And Sihon king of Heshbon hath not been willing to let us pass over by him, for Jehovah thy God hath hardened his spirit, and strengthened his heart, so as to give him into thy hand as at this day.

Joshua 11:12-15

and all the cities of these kings, and all their kings, hath Joshua captured, and he smiteth them by the mouth of the sword; he devoted them, as Moses, servant of Jehovah, commanded.

Judges 14:4

And his father and his mother have not known that from Jehovah it is, that a meeting he is seeking of the Philistines; and at that time the Philistines are ruling over Israel.

1 Samuel 2:25

If a man sin against a man, then hath God judged him; but if against Jehovah a man sin, who doth pray for him?' and they hearken not to the voice of their father, though Jehovah hath delighted to put them to death.

1 Kings 12:15

and the king hearkened not unto the people, for the revolution was from Jehovah, in order to establish His word that Jehovah spake by the hand of Ahijah the Shilonite unto Jeroboam son of Nebat.

1 Kings 22:20-23

and Jehovah saith, Who doth entice Ahab, and he doth go up and fall in Ramoth-Gilead? and this one saith thus, and that one is saying thus.

2 Chronicles 25:16

And it cometh to pass, in his speaking unto him, that he saith to him, 'For a counsellor to the king have we appointed thee? cease for thee; why do they smite thee?' And the prophet ceaseth, and saith, 'I have known that God hath counselled to destroy thee, because thou hast done this, and hast not hearkened to my counsel.'

Isaiah 6:9-10

And He saith, 'Go, and thou hast said to this people, Hear ye -- to hear, and ye do not understand, And see ye -- to see, and ye do not know.

Romans 9:22-23

And if God, willing to shew the wrath and to make known His power, did endure, in much long suffering, vessels of wrath fitted 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 Jehovah saith unto Moses, 'In thy going to turn back to Egypt, see -- all the wonders which I have put in thy hand -- that thou hast done them before Pharaoh, and I -- I strengthen his heart, and he doth not send the people away;
Exodus 9:16
'And yet for this I have caused thee to stand, so as to show thee My power, and for the sake of declaring My Name in all the earth;
Deuteronomy 2:30
'And Sihon king of Heshbon hath not been willing to let us pass over by him, for Jehovah thy God hath hardened his spirit, and strengthened his heart, so as to give him into thy hand as at this day.
Judges 14:4
And his father and his mother have not known that from Jehovah it is, that a meeting he is seeking of the Philistines; and at that time the Philistines are ruling over Israel.
1 Samuel 2:25
If a man sin against a man, then hath God judged him; but if against Jehovah a man sin, who doth pray for him?' and they hearken not to the voice of their father, though Jehovah hath delighted to put them to death.
1 Kings 12:15
and the king hearkened not unto the people, for the revolution was from Jehovah, in order to establish His word that Jehovah spake by the hand of Ahijah the Shilonite unto Jeroboam son of Nebat.
1 Kings 22:20
and Jehovah saith, Who doth entice Ahab, and he doth go up and fall in Ramoth-Gilead? and this one saith thus, and that one is saying thus.
2 Chronicles 25:16
And it cometh to pass, in his speaking unto him, that he saith to him, 'For a counsellor to the king have we appointed thee? cease for thee; why do they smite thee?' And the prophet ceaseth, and saith, 'I have known that God hath counselled to destroy thee, because thou hast done this, and hast not hearkened to my counsel.'
Isaiah 6:9
And He saith, 'Go, and thou hast said to this people, Hear ye -- to hear, and ye do not understand, And see ye -- to see, and ye do not know.
Romans 9:18
so, then, to whom He willeth, He doth kindness, and to whom He willeth, He doth harden.

As the lord

Joshua 11:12
and all the cities of these kings, and all their kings, hath Joshua captured, and he smiteth them by the mouth of the sword; he devoted them, as Moses, servant of Jehovah, commanded.
Deuteronomy 20:16
Only, of the cities of these peoples which Jehovah thy God is giving to thee for an inheritance, thou dost not keep alive any breathing;