1 Kings 16:9-12

9Now his servant Zimri, commander of half his chariots, conspired against him as he was in Tirzah drinking himself drunk in the house of Arza, steward of his house in Tirzah.

10And Zimri went in and struck him and killed him in the twenty-seventh year of Asa king of Judah, and reigned in his place.

11Then it came to pass, when he began to reign, as soon as he was seated on his throne, that he killed all the household of Baasha; he did not leave him one male, neither of his relatives nor of his friends.

12Thus Zimri destroyed all the household of Baasha, according to the word of the Lord, which He spoke against Baasha by Jehu the prophet,