Ahaziah had fallen through the lattice in his upper chamber in Samaria, and lay injured; so he sent messengers, telling them, "Go, inquire of Baal-zebub, the god of Ekron, whether I shall recover from this injury." But the angel of the Lord said to Elijah the Tishbite, "Get up, go to meet the messengers of the king of Samaria, and say to them, 'Is it because there is no God in Israel that you are going to inquire of Baal-zebub, the god of Ekron?'" Now therefore thus says the Lord, "You shall not leave the bed to which you have gone, but you shall surely die.' So Elijah went. (NRSV 1:2-4)
And Ahaziah fell down through a lattice in his upper chamber that was in Samaria, and was sick: and he sent messengers, and said unto them, Go, enquire of Baalzebub the god of Ekron whether I shall recover of this disease. But the angel of the Lord said to Elijah the Tishbite, Arise, go up to meet the messengers of the king of Samaria, and say unto them, Is it not because there is not a God in Israel, that ye go to enquire of Baalzebub the god of Ekron? Now therefore thus saith the Lord, Thou shalt not come down from that bed on which thou art gone up, but shalt surely die. And Elijah departed. (KJV 1:2-4)
God, using Elijah to communicate his message, cuts off Ahaziah's attempt to discover his fate from Baal-zebub and delivers his death warrant. This is meant to demonstrate how much greater God is than Baal-zebub, because he knows to deliver the message without even being asked.
When the king of Moab saw that the battle was going against him, he took with him seven hundred swordsmen to break through, opposite the king of Edom; but they could not. Then he took his firstborn son who was to succeed him, and offered him as a burnt offering on the wall. And great wrath came upon Israel, so they withdrew from him and returned to their own land. (NRSV 3:26-27)
And when the king of Moab saw that the battle was too sore for him, he took with him seven hundred men that drew swords, to break through even unto the king of Edom: but they could not. Then he took his eldest son that should have reigned in his stead, and offered him for a burnt offering upon the wall. And there was great indignation against Israel: and they departed from him, and returned to their own land. (KJV 3:26-27)
Now this is weird. Although the original source material may have meant that the Moabite god Chemosh's wrath was kindled against the Israelites, the narrator here seems to mean that Israel became indignantly wrathful at this horrible sacrifice, and left the battlefield for that reason.
As soon as he had finished presenting the burnt offering, Jehu said to the guards and to the officers, "Come in and kill them; let no one escape." So they put them to the sword. The guards and the officers threw them out, and then went into the citadel of the temple of Baal. They brought out the pillar that was in the temple of Baal, and burned it. Then they demolished the pillar of Baal, and destroyed the temple of Baal, and made it a latrine to this day. (NRSV 10:25-27)
And it came to pass, as soon as he had made an end of offering the burnt offering, that Jehu said to the guard and to the captains, Go in, and slay them; let none come forth. And they smote them with the edge of the sword; and the guard and the captains cast them out, and went to the city of the house of Baal. And they brought forth the images out of the house of Baal, and burned them. And they brake down the image of Baal, and brake down the house of Baal, and made it a draught house unto this day. (KJV 10:25-27)
It's a Baal-destroying fest. Apparently, part of the reason Baal was such a popular deity was because he was sort of similar to Israel's God, associated with the sky and thunder. It's a misjudgment the prophets keep working to correct.
Thus Jehu wiped out Baal from Israel. But Jehu did not turn aside from the sins of Jeroboam son of Nebat, which he caused Israel to commit—the golden calves that were in Bethel and in Dan. The Lord said to Jehu, "Because you have done well in carrying out what I consider right, and in accordance with all that was in my heart have dealt with the house of Ahab, your sons of the fourth generation shall sit on the throne of Israel." But Jehu was not careful to follow the law of the Lord the God of Israel with all his heart; he did not turn from the sins of Jeroboam, which he caused Israel to commit. (NRSV 10:28-31)
Thus Jehu destroyed Baal out of Israel. Howbeit from the sins of Jeroboam the son of Nebat, who made Israel to sin, Jehu departed not from after them, to wit, the golden calves that were in Bethel, and that were in Dan. And the Lord said unto Jehu, Because thou hast done well in executing that which is right in mine eyes, and hast done unto the house of Ahab according to all that was in mine heart, thy children of the fourth generation shall sit on the throne of Israel. But Jehu took no heed to walk in the law of the Lord God of Israel with all his heart: for he departed not from the sins of Jeroboam, which made Israel to sin. (KJV 10:28-31)
Even though Jehu wipes out Baal, he keeps following the sins of Jeroboam. This is bad, but not so bad that God won't reward Jehu for his campaign against Baal-ism.
Ahaz was twenty years old when he began to reign; he reigned sixteen years in Jerusalem. He did not do what was right in the sight of the Lord his God, as his ancestor David had done, but he walked in the way of the kings of Israel. He even made his son pass through fire, according to the abominable practices of the nations whom the Lord drove out before the people of Israel. He sacrificed and made offerings on the high places, on the hills, and under every green tree. (NRSV 16:2-4)
Twenty years old was Ahaz when he began to reign, and reigned sixteen years in Jerusalem, and did not that which was right in the sight of the Lord his God, like David his father. But he walked in the way of the kings of Israel, yea, and made his son to pass through the fire, according to the abominations of the heathen, whom the Lord cast out from before the children of Israel. And he sacrificed and burnt incense in the high places, and on the hills, and under every green tree. (KJV 16:2-4)
The making "his son pass through fire" part probably relates to making child-sacrifice to the god Moloch—not good.
When King Ahaz went to Damascus to meet King Tiglath-pileser of Assyria, he saw the altar that was at Damascus. King Ahaz sent to the priest Uriah a model of the altar, and its pattern, exact in all its details. The priest Uriah built the altar; in accordance with all that King Ahaz had sent from Damascus, just so did the priest Uriah build it, before King Ahaz arrived from Damascus. When the king came from Damascus, the king viewed the altar. Then the king drew near to the altar, went up on it, and offered his burnt offering and his grain offering, poured his drink offering, and dashed the blood of his offerings of well-being against the altar. (NRSV 16:10-13)
And king Ahaz went to Damascus to meet Tiglathpileser king of Assyria, and saw an altar that was at Damascus: and king Ahaz sent to Urijah the priest the fashion of the altar, and the pattern of it, according to all the workmanship thereof. And Urijah the priest built an altar according to all that king Ahaz had sent from Damascus: so Urijah the priest made it against king Ahaz came from Damascus. And when the king was come from Damascus, the king saw the altar: and the king approached to the altar, and offered thereon. And he burnt his burnt offering and his meat offering, and poured his drink offering, and sprinkled the blood of his peace offerings, upon the altar. (KJV 16:10-13)
This is an example of a Judah-ite king being seduced by foreign modes of worship. It's meant to be a cautionary tale of sorts.
He did what was right in the sight of the Lord just as his ancestor David had done. He removed the high places, broke down the pillars, and cut down the sacred pole. He broke in pieces the bronze serpent that Moses had made, for until those days the people of Israel had made offerings to it; it was called Nehushtan. He trusted in the Lord the God of Israel; so that there was no one like him among all the kings of Judah after him, or among those who were before him. (NRSV 18:3-5)
And he did that which was right in the sight of the Lord, according to all that David his father did. He removed the high places, and brake the images, and cut down the groves, and brake in pieces the brasen serpent that Moses had made: for unto those days the children of Israel did burn incense to it: and he called it Nehushtan. He trusted in the Lord God of Israel; so that after him was none like him among all the kings of Judah, nor any that were before him. (KJV 18:3-5)
The bronze serpent was originally a good thing. It helps save the Israelites from fiery, flying snakes in the wilderness in the Book of Numbers. But here, it's apparently become an idol.
The high priest Hilkiah said to Shaphan the secretary, "I have found the book of the law in the house of the Lord." When Hilkiah gave the book to Shaphan, he read it. Then Shaphan the secretary came to the king, and reported to the king, "Your servants have emptied out the money that was found in the house, and have delivered it into the hand of the workers who have oversight of the house of the Lord." Shaphan the secretary informed the king, "The priest Hilkiah has given me a book." Shaphan then read it aloud to the king. When the king heard the words of the book of the law, he tore his clothes. (NRSV 22:8-11)
And Hilkiah the high priest said unto Shaphan the scribe, I have found the book of the law in the house of the Lord. And Hilkiah gave the book to Shaphan, and he read it. And Shaphan the scribe came to the king, and brought the king word again, and said, Thy servants have gathered the money that was found in the house, and have delivered it into the hand of them that do the work, that have the oversight of the house of the Lord. And Shaphan the scribe shewed the king, saying, Hilkiah the priest hath delivered me a book. And Shaphan read it before the king. And it came to pass, when the king had heard the words of the book of the law, that he rent his clothes. (KJV 22:8-11)
Hilkiah has apparently discovered a version of the Book of Deuteronomy. When Josiah hears it read, he tears his clothes because he realizes that they've been practicing their religion all wrong.