1 Kings 16:9-12

9Then his servant Zimri, commander of half his chariotry, conspired against him while he was in Tirzah, making himself drunk in the house of Arza, who was in charge of the palace in Tirzah.

10Then Zimri went in, struck him down and killed him, in the twenty-seventh year of King Asa of Judah, and became king in his place.

11It came about when he became king, as soon as he sat on the throne, he struck down all the household of Baasa, leaving him not even one man, nor his kinsmen nor his friend.

12So Zimri destroyed the entire house of Baasa, according to the word of Adonai which He spoke against Baasa by the prophet Jehu,