Jehu departed from there and encountered Rechab's son Jehonadab. Jehu greeted him, and asked, "Are you as committed to me as I am to you?" Jehonadab responded, "Yes, I am." "If so," said Jehu, "then give me your hand." So Jehonadab put out his hand, and Jehu pulled him up into the chariot.
Jehu said, "Come with me and see my zeal for the LORD." So Jehu had Jehonadab ride with him in his chariot.
When Jehu arrived in Samaria, he killed all those belonging to Ahab who were left in Samaria until they were completely wiped out, in agreement with the LORD's word that was spoken to Elijah.
Then Jehu gathered all the people, saying to them, "Ahab served Baal a little. Jehu will serve him a great deal!
So invite all of Baal's prophets, all his worshippers, and all his priests to come to me. Don't leave anyone out, because I have a great sacrifice planned for Baal. Anyone who doesn't show up won't survive." But Jehu was lying so that he could wipe out Baal's worshippers.
Jehu called for a holy assembly for Baal, and it was done.
Jehu then sent word throughout Israel. All Baal's worshippers came. No one stayed away. They entered Baal's temple until it was packed from one end to the other.
Then Jehu said to the person in charge of the vestments, "Bring out the special clothes for all Baal's worshippers." So he brought out robes for them.
Then Jehu and Jehonadab, Rechab's son, entered Baal's temple. They said to Baal's worshippers, "Make sure there are no worshippers of the LORD here with you. There should be only Baal worshippers."
Then they went in to offer sacrifices and entirely burned offerings. But Jehu had stationed eighty soldiers outside and told them, "I'm handing these people over to you. Whoever lets even one of them escape will pay for it with his life."
So when Jehu finished offering the entirely burned offering, he said to the guards and the officers, "Go in and kill everyone! Don't let anyone escape!" They killed the Baal worshippers without mercy. The guards and the officers then disposed of the bodies and entered the inner part of Baal's temple.
They brought the sacred pillar out of Baal's temple and burned it.
They tore down Baal's sacred pillar and destroyed Baal's temple, turning it into a public restroom, which is what it still is today.
This is how Jehu eliminated Baal from Israel.
However, Jehu didn't deviate from the sins that Jeroboam, Nebat's son, had caused Israel to commit—specifically, the gold calves that were in Bethel and Dan.