2nd Kings Chapter Twelve

 2Ki 12:1  Joash reigned in the seventh year of Jehu. And he reigned forty years in Jerusalem; and the name of his mother was Zibiah of Beer-sheba. 

2Ki 12:2  And Joash did that which was good in the eyes of Jehovah all his days in which Jehoiada the priest guided him; 

2Ki 12:3  only, the high places were not destroyed; the people still sacrificed and offered incense in high places. 

2Ki 12:4  And Joash said to the priests, All the silver of the devoted things that is brought into the house of Jehovah, the silver coming over, each man the silver of his valuation, all the silver that comes upon any man's heart to bring into the house of Jehovah, 

2Ki 12:5  even the priests shall take to themselves, each man from his friend; and they shall repair the breach of the house, in all places where a breach may be found. 

2Ki 12:6  And it happened, in the twenty third year of King Joash, that the priests had not repaired the breach of the house. 

2Ki 12:7  And King Joash called to Jehoiada the priest, and the priests, and said to them, Why have you not repaired the breach of the house? And now, do not receive any silver from your friends, but give it for the breach of the house. 

2Ki 12:8  And the priests consented not to receive silver from the people, nor to strengthen the breach of the house. 

2Ki 12:9  And Jehoiada the priest took a chest and cut a hole in its lid, and put it near the altar, on the right side, as one comes into the house of Jehovah, and the priests who kept the door put in it all the silver brought into the house of Jehovah. 

2Ki 12:10  And it happened, when they saw that the silver in the chest was plentiful, that a scribe of the king, and the high priest went up, and they bound it up, and counted the silver found in the house of Jehovah. 

2Ki 12:11  And they weighed silver into the hands of those doing the work, those overseeing the house of Jehovah; and they gave it, weighed it out, to the craftsmen in wood, and to the builders who were working on the house of Jehovah, 

2Ki 12:12  and to the masons, and the stone cutters, and to buy wood and cut stone to strengthen the breach of the house of Jehovah; and for all that went out on the house, to make it strong. 

2Ki 12:13  However, there were not made for the house of Jehovah basins of silver, snuffers, bowls, trumpets, any vessels of gold or vessels of silver, of the silver brought into the house of Jehovah; 

2Ki 12:14  for they gave it to those doing the work, and they made strong the house of Jehovah with it. 

2Ki 12:15  And they did not reckon with the men into whose hand they gave the silver, to give to those doing the work, for they were dealing with faithfulness. 

2Ki 12:16  And the guilt offering silver and the sin offering silver was not brought into the house of Jehovah, for it was the priests'. 

2Ki 12:17  Then Hazael the king of Syria went up and fought against Gath, and captured it; and Hazael set his face to go up against Jerusalem. 

2Ki 12:18  And Joash the king of Judah took all the dedicated things that Jehoshaphat, and Jehoram, and Ahaziah, his fathers, the kings of Judah, had dedicated, and his own dedicated things, and all the gold found in the treasures of the house of Jehovah, and of the house of the king, and sent to Hazael the king of Syria; and he went away from Jerusalem. 

2Ki 12:19  And the rest of the acts of Joash, and all that he did, are they not written in the Book of the Matters of the Days of the Kings of Judah? 

2Ki 12:20  And his servants rose up and made a conspiracy and killed Joash in the house of Millo, which goes down to Silla. 

2Ki 12:21  For Jozachar the son of Shimeath, and Jehozabad the son of Shomer, his servants, struck him; and he died. And they buried him with his fathers in the city of David. And his son Amaziah reigned in his place. 

Verses 1-16, 2nd Chronicles 24:1-14 Summary:  Joash confronts Jehoiada and the priests for taking money and not rebuilding damages to the temple. Jehoiada takes up a collection and they begin the work. The workman are trustworthy and are not required to show accounting.
2nd Chron.: Joash given two wives. Joash leverages the tax as a "levy from Moses" to encourage the priests. Baal priests had broken into the house and had used the holy implements for Baal worship. There is a proclamation sent through the land for the people to pay the levy. They do it cheerfully. The king and Jehoiada administer payments. After repairing the temple, holy utensils are made. Offerings are made continually during the life of Jehoiada.

4. Why did the temple need repairing? In this context, it looks like Baal priests had vandalized the temple.
Also: The temple's holy implements were used by king Asa as payment to the Syrians to fight Baasha (1Kings 15). During the reign of Rehoboam, Shishak of Egypt sacked the temple implements and golden shields Solomon had made (1Kings 14). 2nd Chronicles 21: We find judgment against Jehoram of Judah. Philistines, and southern Arabians sack the house of Jehoram. With these victories, it is unlikely the temple went untouched.

NOTE: Did you question why the money collected thus far was not used? Why did they start a new collection? On the surface it seems a little shaky. Twenty-three years and no repairs. Where did the money go? One thing that cannot be questioned (to me) is Jehoiada's faithfulness to God, so the stealing of temple funds was unlikely. Many commentators characterize this neglect as stealing. What seems as likely is that the funds were just enough to fund the priests and there was little left over. Priests did not hold land and as such, depended on grazing rights, sacrifices and donations for their living. Priests in Jerusalem would have little in the way of making a living. 
The fact that it took twenty-three years to this point does raise some questions. What lessons might we learn from this?

Verses 17-21 Summary: Hazael threatens Jerusalem. Joash responds by giving Hazael all the "dedicated things," and gold in the temple and his house. Eventually, two of Joash's servant murder him.

2nd Chronicles 24:15-27 (The amazing apostacy of Joash): Jehoiada dies. He is buried with David. Princes and other leaders confer with Joash to apostacy. They turn their backs on God and commit idolatry. God sends prophets to warn them but they do not listen.  Zechariah, the son of Jehoiada confronts Joash with his sin and the king has Zechariah stoned on the spot. Zechariah claims "Jehovah shall seek you out" as he is dying. Syria sacks Jerusalem and God has Syria rout Judah. They plunder the nation quite easily since God was turned away from. Because of his treachery against Zechariah, Joash's own servants murder him. Joash is buried in the city, but not with the kings.

5. What lesson do we learn from Jehoiada? In my mind the big lesson is revealed by the heart of Joash. Joash was rescued by Jehoiada. Jehoiada was a faithful servant who sought after God and his influence saved the lineage of David. (think....JESUS!)

Jehoiada was in the right place at the right time. God's promise of David's lineage was existentially threatened. Jehoiada was married to the king's daughter. Though not a warrior, he acted like one by usurping Athaliah's treachery. He risked his life for Joash.
It took little persuasion for Joash to turn against Zechariah and totally disrespect the grace and mercy afforded to him by Jehoiada. (That's why it must have seemed justifiable to murder Joash) 

6. What lessons can we learn from the apostacy of Joash? At aged forty-seven, you'd hope Joash was solid. He followed the directives of Jehoiada, but in the end, preferred idolatry, his "friends" and perhaps being "popular and new." Nothing really new. At least he had the decency to listen to Jehoiada. In the end, his cowardly heart was revealed.