1 Kings 2:20-23 New King James Version (NKJV)

20. Then she said, “I desire one small petition of you; do not refuse me.”And the king said to her, “Ask it, my mother, for I will not refuse you.”

21. So she said, “Let Abishag the Shunammite be given to Adonijah your brother as wife.”

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.”

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!

1 Kings 2