1 Kings 20:42

He said to the king, “Thus says the Lord: ‘Because you have released from your hand the man [Ben-hadad] whom I had devoted to destruction, your life shall be required for his life, and your people for his people.’”

1 Kings 22:31-37

Now the king of Aram (Syria) had commanded the thirty-two captains of his chariots, saying, “Do not fight with [anyone, either] small or great, but with [Ahab] the king of Israel alone.”

1 Kings 20:39

As the king passed by, the prophet called out to the king and said, “Your servant went out into the middle of the battle, and behold, a man turned aside and brought a man to me and said, ‘Guard this man; if for any reason he is missing, then your life shall be required for his life, or else you shall pay a talent of silver.’

1 Samuel 15:9-11

Saul and the people spared Agag and the best of the sheep, the oxen, the fatlings, the lambs, and everything that was good, and they were not willing to destroy them entirely; but everything that was undesirable or worthless they destroyed completely.

1 Kings 20:34

Ben-hadad [tempting him] said to him, “I will restore the cities which my father took from your father; and you may set up bazaars (shops) of your own in Damascus, as my father did in Samaria.” Then, Ahab replied, “I will let you go with this covenant (treaty).” So he made a covenant with him and let him go.

2 Kings 6:24

But it came about after this, that Ben-hadad king of Aram (Syria) gathered his whole army together and went up and besieged Samaria.

2 Kings 8:12

Hazael said, “Why are you weeping, my lord?” He answered, “Because I know the evil that you will do to the sons (descendants) of Israel. You will set their strongholds on fire, kill their young men with the sword, smash their children to pieces, and rip up their pregnant women.”

2 Chronicles 18:33-34

Then a certain man drew his bow at random and struck [Ahab] the king of Israel between the scales of his armor. So Ahab said to his chariot driver, “Turn around and take me out of the battle, because I am seriously 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
Ben-hadad [tempting him] said to him, “I will restore the cities which my father took from your father; and you may set up bazaars (shops) of your own in Damascus, as my father did in Samaria.” Then, Ahab replied, “I will let you go with this covenant (treaty).” So he made a covenant with him and let him go.
1 Kings 22:31
Now the king of Aram (Syria) had commanded the thirty-two captains of his chariots, saying, “Do not fight with [anyone, either] small or great, but with [Ahab] the king of Israel alone.”
1 Samuel 15:9
Saul and the people spared Agag and the best of the sheep, the oxen, the fatlings, the lambs, and everything that was good, and they were not willing to destroy them entirely; but everything that was undesirable or worthless they destroyed completely.

Thy life shall go

1 Kings 22:31
Now the king of Aram (Syria) had commanded the thirty-two captains of his chariots, saying, “Do not fight with [anyone, either] small or great, but with [Ahab] the king of Israel alone.”
2 Kings 6:24
But it came about after this, that Ben-hadad king of Aram (Syria) gathered his whole army together and went up and besieged Samaria.
2 Kings 8:12
Hazael said, “Why are you weeping, my lord?” He answered, “Because I know the evil that you will do to the sons (descendants) of Israel. You will set their strongholds on fire, kill their young men with the sword, smash their children to pieces, and rip up their pregnant women.”
2 Chronicles 18:33
Then a certain man drew his bow at random and struck [Ahab] the king of Israel between the scales of his armor. So Ahab said to his chariot driver, “Turn around and take me out of the battle, because I am seriously wounded.”