1 Kings 2:20-22

20Then she said: “I ask one small petition of you; do not deny.” “Ask, my mother,” the king said to her, “for I will not turn you down.”

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

22King Solomon answered and said to his mother: “So why are you asking Abishag the Shunammite for Adonijah? Ask for him the kingdom as well—for he is my older brother—for him and for Abiathar the kohen, and for Joab son of Zeruiah!”