Ahab had seventy sons living in Samaria. So Jehu wrote letters and sent them to Samaria to the leading officials of Jezreel and to the guardians of Ahab's dynasty. This is what the letters said,
So the palace supervisor, the city commissioner, the leaders, and the guardians sent this message to Jehu, "We are your subjects! Whatever you say, we will do. We will not make anyone king. Do what you consider proper."
He wrote them a second letter, saying, "If you are really on my side and are willing to obey me, then take the heads of your master's sons and come to me in Jezreel at this time tomorrow." Now the king had seventy sons, and the prominent men of the city were raising them.
When they received the letter, they seized the king's sons and executed all seventy of them. They put their heads in baskets and sent them to him in Jezreel.
The messenger came and told Jehu, "They have brought the heads of the king's sons." Jehu said, "Stack them in two piles at the entrance of the city gate until morning."
In the morning he went out and stood there. Then he said to all the people, "You are innocent. I conspired against my master and killed him. But who struck down all of these men?
Therefore take note that not one of the judgments the LORD announced against Ahab's dynasty has failed to materialize. The LORD had done what he announced through his servant Elijah."
Jehu encountered the relatives of King Ahaziah of Judah. He asked, "Who are you?" They replied, "We are Ahaziah's relatives. We have come down to see how the king's sons and the queen mother's sons are doing."
When he left there, he met Jehonadab, son of Rekab, who had been looking for him. Jehu greeted him and asked, "Are you as committed to me as I am to you?" Jehonadab answered, "I am!" Jehu replied, "If so, give me your hand." So he offered his hand and Jehu pulled him up into the chariot.
So now, bring to me all the prophets of Baal, as well as all his servants and priests. None of them must be absent, for I am offering a great sacrifice to Baal. Any of them who fail to appear will lose their lives." But Jehu was tricking them so he could destroy the servants of Baal.
Jehu sent invitations throughout Israel, and all the servants of Baal came; not one was absent. They arrived at the temple of Baal and filled it up from end to end.
Then Jehu and Jehonadab son of Rekab went to the temple of Baal. Jehu said to the servants of Baal, "Make sure there are no servants of the LORD here with you; there must be only servants of Baal."
They went inside to offer sacrifices and burnt offerings. Now Jehu had stationed eighty men outside. He had told them, "If any of the men inside get away, you will pay with your lives!"
When he finished offering the burnt sacrifice, Jehu ordered the royal guard and officers, "Come in and strike them down! Don't let any escape!" So the royal guard and officers struck them down with the sword and left their bodies lying there. Then they entered the inner sanctuary of the temple of Baal.
The LORD said to Jehu, "You have done well. You have accomplished my will and carried out my wishes with regard to Ahab's dynasty. Therefore four generations of your descendants will rule over Israel."
But Jehu did not carefully and wholeheartedly obey the law of the LORD God of Israel. He did not repudiate the sins which Jeroboam had encouraged Israel to commit.
He conquered all the land of Gilead, including the territory of Gad, Reuben, and Manasseh, extending all the way from the Aroer in the Arnon Valley through Gilead to Bashan.
The rest of the events of Jehu's reign, including all his accomplishments and successes, are recorded in the scroll called the Annals of the Kings of Israel.