1 Kings 20:42

And he said unto the king, "Thus sayeth the LORD, 'Because thou hast let go a man that ought to have died, thy life shall go for his life, and thy people for his."

1 Kings 22:31-37

But the king of Syria had commanded the captains of his chariots, of which he had thirty two, saying, "Fight neither with small nor great, save with the king of Israel only."

1 Kings 20:39

And when the king came by, he cried unto him and said, "Thy servant went out in the midst of the battle. And see, there was one began to flee. And there came a man to me and said, 'Keep this man. And if he be missed thy life shall go for his, or else thou shalt pay a talent of silver.'

1 Samuel 15:9-11

But Saul and the people spared Agag, and they left of the sheep and of the oxen and fat things and the lambs and all that was good, and would not destroy them. But all that was nought worth and flaggy, that they destroyed utterly.

1 Kings 20:34

And Benhadad said, "The cities which my father took from thy father, I will restore again. And thou shalt make streets for thee in Damascus, as my father did in Samaria. And I will make a covenant with thee and send thee away." And so he made a covenant with him and sent him away.

2 Kings 6:24

After this, Benhadad king of Syria gathered all the Host, and went and besieged Samaria.

2 Kings 8:12

And Hazael said, "Why weepeth my lord?" And he answered, "For I know that thou shalt do evil unto the children of Israel: their strong cities thou shalt set on fire, and their young men thou shalt slay with the sword, and shalt dash out the brains of their sucking children: and all to tear their women with child."

2 Chronicles 18:33-34

And a certain man drew his bow ignorantly and smote the king of Israel between the Joints of his habergeon. And he said to the chariot man, turn thine hand and carry me out of the host, for I am hurt.

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, "The cities which my father took from thy father, I will restore again. And thou shalt make streets for thee in Damascus, as my father did in Samaria. And I will make a covenant with thee and send thee away." And so he made a covenant with him and sent him away.
1 Kings 22:31
But the king of Syria had commanded the captains of his chariots, of which he had thirty two, saying, "Fight neither with small nor great, save with the king of Israel only."
1 Samuel 15:9
But Saul and the people spared Agag, and they left of the sheep and of the oxen and fat things and the lambs and all that was good, and would not destroy them. But all that was nought worth and flaggy, that they destroyed utterly.

Thy life shall go

1 Kings 22:31
But the king of Syria had commanded the captains of his chariots, of which he had thirty two, saying, "Fight neither with small nor great, save with the king of Israel only."
2 Kings 6:24
After this, Benhadad king of Syria gathered all the Host, and went and besieged Samaria.
2 Kings 8:12
And Hazael said, "Why weepeth my lord?" And he answered, "For I know that thou shalt do evil unto the children of Israel: their strong cities thou shalt set on fire, and their young men thou shalt slay with the sword, and shalt dash out the brains of their sucking children: and all to tear their women with child."
2 Chronicles 18:33
And a certain man drew his bow ignorantly and smote the king of Israel between the Joints of his habergeon. And he said to the chariot man, turn thine hand and carry me out of the host, for I am hurt.