See the marginal reference and 1 Kings 11:14 note.

The palaces of Ben-hadad - Damascus was a seat of the Syrian kings, and Ben-hadad was a name common to several of its kings.

And I will kindle a fire in the wall of Damascus,.... Signifying either that, a breach being made there the destruction of the city should begin, and be carried on until it was completed; or it may be understood literally, that first the houses built upon the wall should beset on fire by the Chaldeans, through the divine permission, and according to his order and wilt, and therefore ascribed to him, which should proceed further. Compare with this 2 Corinthians 11:32;

and it shall consume the palaces of Benhadad; not only the houses of the common people in general, but particularly the palaces of their king and his nobles; Benhadad being a name of one of the kings of Syria, 1 Kings 20:1; and which, according to Kimchi, was the name of the king of Syria at the time of the destruction of Damascus by Nebuchadnezzar. Some think that this was a common name of the kings of Syria, as Pharaoh and Ptolemy with the Egyptians. It signifies the son of Hadad, which was the name of their idol; from whence their kings might be called, as was usual with the Assyrians and Babylonians.

Jeremiah 49:27 has been imitated from Amos 1:4 and Jeremiah 49:14 conjointly. בּחמת, not "on," but "in," i.e., "within the wall." "The palaces of Benhadad" are the palaces of the Syrian kings generally, because three kings of Damascus bore this name.

The fulfilment of this threat cannot be proved historically, from want of information. Since Pharaoh-Necho had conquered Syria as far as the Euphrates, it is very possible that, after the defeat of the Egyptians at Carchemish, in the conquest of Syria by Nebuchadnezzar, Damascus was harshly treated. The prophecy is, however, so general in its statement, that we need not confine its fulfilment to the conquest by Nebuchadnezzar.

And I will kindle a fire in the wall of Damascus, and it shall consume the palaces of {b} Benhadad.

(b) Who was king of Syria, 1Ki 20:26 and had built these palaces which were still called the palaces of Benhadad.

49:27 Ben - hadad - Was the common name of the kings of Syria.

27. palaces of Ben-hadad-that palace from which so many evils and such cruelty to Israel emanated; thus implying the cause of Damascus' overthrow. Not the Ben-hadad of 2Ki 13:3; Am 1:4; it was a common name of the Syrian kings (compare 1Ki 15:18; meaning "son of Hadad," the idol).

49:23-27 How easily God can dispirit those nations that have been most celebrated for valour! Damascus waxes feeble. It was a city of joy, having all the delights of the sons of men. But those deceive themselves who place their happiness in carnal joys.