1 Kings 16:9-13

And his servant Zimri, commander of half his chariots, conspired against him. Now Elah was in Tirzah drinking himself drunk in the house of Arza, who was in charge of the household in Tirzah.

Then Zimri came in and struck him and put him to death in the twenty-seventh year of Asa king of Judah, and he became king in his place.

And when he became king, as soon as he sat on his throne, he killed all the household of Baasha; he did not leave a single male alive, either of his relatives or of his friends.

So Zimri eliminated all the household of Baasha, in accordance with the word of the Lord which He spoke against Baasha through Jehu the prophet,

for all the sins of Baasha and the sins of his son Elah, which they committed and into which they misled Israel, provoking the Lord God of Israel to anger with their idols.