Thematic Bible: Intermarrying with, of kings considered treason

And she said, Let Abishag the Shunammite be given to Adonijah thy brother to wife. And king Solomon answered and said to his mother, And why do thou ask Abishag the Shunammite for Adonijah? Ask for him the kingdom also, for he is my elder brother, even for him, and for Abiathar the priest, and for Joab the son of Then king Solomon swore by LORD, saying, God do so to me, and more also, if Adonijah has not spoken this word against his own life. read more.
Now therefore as LORD lives, who has established me, and set me on the throne of David my father, and who has made me a house as he promised, surely Adonijah shall be put to death this day.