Then 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.
1 Kings 16:11
Surrounding context
16:10 And Zimri went in and struck him and killed him in the twenty-seventh year of Asa king of Judah, and reigned in his place.
16:11 Then 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.
16:12 Thus Zimri destroyed all the household of Baasha, according to the word of the LORD, which He spoke against Baasha by Jehu the prophet,