Bible Verses About Widows: Intermarrying with, of kings considered treason

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

King Solomon answered his mother, “Why do you request Abishag the Shunammite for Adonijah? Since he is my older brother, you might as well request the kingdom for him and for Abiathar the priest and for Joab son of Zeruiah!”

Then King Solomon swore by the LORD: “May God punish me, and ever so severely, if Adonijah has not made this request at the expense of his life.

And now, as surely as the LORD lives—the One who established me, who set me on the throne of my father David, and who founded for me a dynasty as He promised—surely Adonijah shall be put to death today!”