29 And they encamped one over against the other seven days. And so it was, that in the seventh day the battle was joined; and the children of Israel slew of the Syrians a hundred thousand footmen in one day. 30 But the rest fled to Aphek, into the city; and the wall fell upon twenty and seven thousand men that were left. And Ben-hadad fled, and came into the city, into an inner chamber.

31 And his servants said unto him, Behold now, we have heard that the kings of the house of Israel are merciful kings: let us, we pray thee, put sackcloth on our loins, and ropes upon our heads, and go out to the king of Israel: peradventure he will save thy life. 32 So they girded sackcloth on their loins, and [put] ropes on their heads, and came to the king of Israel, and said, Thy servant Ben-hadad saith, I pray thee, let me live. And he said, Is he yet alive? he is my brother. 33 Now the men observed diligently, and hasted to catch whether it were his mind; and they said, Thy brother Ben-hadad. Then he said, Go ye, bring him. Then Ben-hadad came forth to him; and he caused him to come up into the chariot. 34 And [Ben-hadad] said unto him, The cities which my father took from thy father I will restore; and thou shalt make streets for thee in Damascus, as my father made in Samaria. And I, [said Ahab], will let thee go with this covenant. So he made a covenant with him, and let him go.

Matthew Henry's Commentary on 1 Kings 20:29-34

Commentary on 1 Kings 20:22-30

(Read 1 Kings 20:22-30)

Those about Benhadad advised him to change his ground. They take it for granted that it was not Israel, but Israel's gods, that beat them; but they speak very ignorantly of Jehovah. They supposed that Israel had many gods, to whom they ascribed limited power within a certain district; thus vain were the Gentiles in their imaginations concerning God. The greatest wisdom in worldly concerns is often united with the most contemptible folly in the things of God.

Commentary on 1 Kings 20:31-43

(Read 1 Kings 20:31-43)

This encouragement sinners have to repent and humble themselves before God; Have we not heard, that the God of Israel is a merciful God? Have we not found him so? That is gospel repentance, which flows from an apprehension of the mercy of God, in Christ; there is forgiveness with him. What a change is here! The most haughty in prosperity often are most abject in adversity; an evil spirit will thus affect a man in both these conditions. There are those on whom, like Ahab, success is ill bestowed; they know not how to serve either God or their generation, or even their own true interests with their prosperity: Let favour be showed to the wicked, yet will he not learn righteousness. The prophet designed to reprove Ahab by a parable. If a good prophet were punished for sparing his friend and God's when God said, Smite, of much sorer punishment should a wicked king be thought worthy, who spared his enemy and God's, when God said, Smite. Ahab went to his house, heavy and displeased, not truly penitent, or seeking to undo what he had done amiss; every way out of humour, notwithstanding his victory. Alas! many that hear the glad tidings of Christ, are busy and there till the day of salvation is gone.