There was probably a considerable interval between the conclusion of the arrangement for the repairs and the Syrian expedition related in these verses. For the events which had happened, see 2 Chronicles 24:15-22.
This is the first and last time that we hear of the Damascene Syrians undertaking so distant an expedition. Gath (see Joshua 13:3 note) could only be reached from Syria through Israel or Judah. It was not more than 25 or 30 miles from Jerusalem. It is uncertain whether the city belonged at this time to Judah or to the Philistines.
Hazael set his face ... - This is a phrase for determination generally, but especially for determination to proceed somewhere (compare Jeremiah 42:15; Luke 9:51). Jerusalem can scarcely have been the primary object of this expedition, or it would have been attacked by a less circuitous route. Perhaps the Syrians were induced to make a sudden march against the Jewish capital, by learning, while at Gath, that a revolution had occurred there (compare 2 Chronicles 24:18-23).
Jehoash did not submit without a struggle. See the details in Chronicles. It was not until his army was defeated that he followed the example of his ancestor, Asa, and bought the friendship of the Syrians with the temple treasures (1 Kings 15:18. Compare the conduct of Hezekiah, 2 Kings 18:15-16).
Jehoram and Ahaziah - Though these two monarchs had been worshippers of Baal, yet they had combined with that idolatrous cult a certain amount of decent respect for the old religion. It is evident from this passage that they had made costly offerings to the temple.