1 Kings 2:23-25

23Then king Solomon sware by Yhwh, saying, God do so to me, and more also, if Adonijah have not spoken this word against his own life.

24Now therefore, as Yhwh liveth, which hath established me, and set me on the throne of David my father, and who hath made me an house, as he promised, Adonijah shall be put to death this day.

25And king Solomon sent by the hand of Benaiah the son of Jehoiada; and he fell upon him that he died.