1 Kings 2:15, 22-24

“As you know,” he said, “the kingdom was mine. All Israel looked to me as their king. But things changed, and the kingdom has gone to my brother; for it has come to him from the LORD.

King Solomon answered his mother, “Why do you request Abishag the Shunammite for Adonijah? You might as well request the kingdom for him—after all, he is my older brother—yes, for him and for Abiathar the priest and Joab son of Zeruiah!” Then King Solomon swore by the LORD: “May God deal with me, be it ever so severely, if Adonijah does not pay with his life for this request! And now, as surely as the LORD lives—he who has established me securely on the throne of my father David and has founded a dynasty for me as he promised—Adonijah shall be put to death today!”