And the prophet said to the king, “This is what the LORD says: ‘Because you have let slip from your hand the man I had devoted to destruction, your life will be exchanged for his life, and your people for his people.’”
Here is an account of what followed upon the victory which Israel obtained over the Syrians. I. Ben-hadad's tame and mean submission. Even in his inner chamber he feared, and would, if he could, flee further, though none pursued. His servants, seeing him and themselves reduced to the last extremity, advised that they should surrender at discretion, and make themselves prisoners and petitioners to Ahab for their lives, Kg1 20:31.
Commenting on 1 Kings 20:31-43
And he said unto him, thus saith the Lord,.... He spake not his own sense, and in his own words, but in the name of the Lord, for which he had authority, that it might have the greater weight with Ahab: because thou hast let go out of thy hand a man whom I appointed to utter destruction; meaning Benhadad; or "the man of my...
Thy life shall go for his life - This was fulfilled at the battle of Ramoth-gilead, where he was slain by the Syrians; see Kg1 22:34, Kg1 22:35.