1 Kings 2:20-22

20Then she said, "I have one small request to make of you; do not refuse me." And the king said to her, "Make your request, my mother, for I will not refuse you."

21She said, "Let Abishag the Shunammite be given to Adonijah your brother as his wife."

22King Solomon answered his mother, "And why do you ask Abishag the Shunammite for Adonijah? Ask for him the kingdom also, for he is my older brother, and on his side are Abiathar the priest and Joab the son of Zeruiah."