NET
23 King Solomon then swore an oath by the Lord, “May God judge me severely, if Adonijah does not pay for this request with his life!
Darby
23 And king Solomon swore by Jehovah saying, God do so to me, and more also, Adonijah has spoken this word against his own life!
KJV
23 Then king Solomon sware by the LORD, saying, God do so to me, and more also, if Adonijah have not spoken this word against his own life.