Then King Solomon swore by the LORD, saying, "May God do so to me, and more also, if Adonijah has not spoken this word against his own life!
1 Kings 2:23
Surrounding context
2:22 And King Solomon answered and said to his mother, "Now why do you ask Abishag the Shunammite for Adonijah? Ask for him the kingdom also--for he is my older brother--for him, and for Abiathar the priest, and for Joab the son of Zeruiah."
2:23 Then King Solomon swore by the LORD, saying, "May God do so to me, and more also, if Adonijah has not spoken this word against his own life!
2:24 Now therefore, as the LORD lives, who has confirmed me and set me on the throne of David my father, and who has established a house for me, as He promised, Adonijah shall be put to death today!"