1 Kings 20:42

And he said unto him, Thus hath the LORD said, Because thou hast let go out of thy hand the man of my anathema, therefore, thy life shall go for his life and thy people for his people.

1 Kings 22:31-37

But the king of Syria commanded his thirty-two captains that had rule over his chariots, saying, Fight neither with small nor great, but only with the king of Israel.

1 Kings 20:39

And as the king passed by, he cried unto the king, and he said, Thy slave went out into the midst of the battle; and, behold, a man turned aside and brought a man unto me and said, Guard this man; if by any means he should get away, then shall thy life be for his life, or else thou shalt pay a talent of silver.

1 Samuel 15:9-11

But Saul and the people spared Agag and the best of the sheep and of the oxen and of the fatlings and the lambs and all that was good and would not utterly destroy them, but every thing that was vile and refuse, that they destroyed utterly.

1 Kings 20:34

And Benhadad said unto him, The cities, which my father took from thy father, I will restore; and thou shalt make plazas for thee in Damascus, as my father made in Samaria, and I will leave here confederated with thee. So he made a covenant with him and sent him away.

2 Kings 6:24

And it came to pass after this, that Benhadad, king of Syria, gathered all his host and went up and besieged Samaria.

2 Kings 8:12

Then Hazael said unto him, Why does my lord weep? And he answered, Because I know the evil that thou wilt do unto the sons of Israel; their strong holds wilt thou set on fire, and their young men wilt thou slay with the sword and wilt dash their children and rip up their women with child.

2 Chronicles 18:33-34

But a certain man drew a bow in all his perfection and smote the king of Israel between the joints of his coat of mail; therefore, he said to his chariot man, Turn thy hand, and carry me out of the camp, for I am wounded.

Treasury of Scripture Knowledge

Summary

And he said unto him, Thus saith the LORD, Because thou hast let go out of thy hand a man whom I appointed to utter destruction, therefore thy life shall go for his life, and thy people for his people.

Bible References

Because

1 Kings 20:34
And Benhadad said unto him, The cities, which my father took from thy father, I will restore; and thou shalt make plazas for thee in Damascus, as my father made in Samaria, and I will leave here confederated with thee. So he made a covenant with him and sent him away.
1 Kings 22:31
But the king of Syria commanded his thirty-two captains that had rule over his chariots, saying, Fight neither with small nor great, but only with the king of Israel.
1 Samuel 15:9
But Saul and the people spared Agag and the best of the sheep and of the oxen and of the fatlings and the lambs and all that was good and would not utterly destroy them, but every thing that was vile and refuse, that they destroyed utterly.

Thy life shall go

1 Kings 22:31
But the king of Syria commanded his thirty-two captains that had rule over his chariots, saying, Fight neither with small nor great, but only with the king of Israel.
2 Kings 6:24
And it came to pass after this, that Benhadad, king of Syria, gathered all his host and went up and besieged Samaria.
2 Kings 8:12
Then Hazael said unto him, Why does my lord weep? And he answered, Because I know the evil that thou wilt do unto the sons of Israel; their strong holds wilt thou set on fire, and their young men wilt thou slay with the sword and wilt dash their children and rip up their women with child.
2 Chronicles 18:33
But a certain man drew a bow in all his perfection and smote the king of Israel between the joints of his coat of mail; therefore, he said to his chariot man, Turn thy hand, and carry me out of the camp, for I am wounded.