Matthew Henry on 2 Kings 12:17–end
When Joash had revolted from God and become both an idolater and a persecutor the hand of the Lord went out against him, and his last state was worse than his first.
I. His wealth and honour became an easy prey to his neighbours. Hazael, when he had chastised Israel (Kg2 10:32), threatened Judah and Jerusalem likewise, took Gath, a strong city (Kg2 12:17), and thence intended to march with his forces against Jerusalem, the royal city, the holy city, but whose defence, on account of its sinfulness, had departed. Joash had neither spirit nor strength to make head against him, but gave him all the hallowed things, and all the gold that was found both in his exchequer and in the treasures of the…
Read the whole note in the consoleJamieson-Fausset-Brown on 2 Kings 12:17
Then Hazael . . . fought against Gath--(See on Ch2 24:23).
Adam Clarke on 2 Kings 12:19
The rest of the acts of Joash - We have already seen that this man, so promising in the beginning of his reign, apostatized, became an idolater, encouraged idolatry among his subjects, and put the high priest Zechariah, the son of Jehoiada his benefactor, to death; and now God visited that blood upon him by the hands of the tyrannous king of Syria, and by his own servants.
John Gill on 2 Kings 12:19
And the rest of the acts of Jehoash, and all that he did, are they not written in the book of the chronicles of the kings of Judah? In the registers and annals of those princes; some of them are to be met with in 2 Chronicles 24:1.
Keil & Delitzsch on 2 Kings 12:19–end
Conspiracy against Joash. - Not long after the departure of the Syrians, who had left Joash, according to Ch2 24:25, with many wounds, his servants formed a conspiracy against him and slew him upon his bed in the house Millo, which goeth down to Silla. This description of the locality is perfectly obscure for us. The conjecture that בּית־מלּא was the house in the castle of Millo which is so frequently mentioned (see at Kg1 9:15 and Sa2 5:9), is precluded by the fact that this castle is always called המּלּא (with the article). סלּא is regarded by many as an abbreviation of מסלּה, "which goes down by the road;" and Thenius supposes that the reference is to the road which ran diagonally through…