Abishag in the Bible

So they sought for a fair damsel throughout all the borders of Israel, and found Abishag a Shunamite, and brought her to the king.

And Bath-sheba went to the king into the chamber: and the king was very old; and Abishag the Shunamite ministered to the king.

And he said, Speak, I pray thee, to Solomon the king, (for he will not say to thee no,) that he give me Abishag the Shunamite for a wife.

And she said, Let Abishag the Shunamite be given to Adonijah thy brother for a wife.

And king Solomon answered and said to his mother, And why dost thou ask Abishag the Shunamite 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 Zeruiah.