Reference

1 Kings 2:22

And king Solomon answered and said unto his mother, And why dost thou ask Abishag the Shunammite for Adonijah? ask for him the kingdom also; for he is mine elder brother; even for him, and for Abiathar the priest, and for Joab the son of Zeruiah.
20

Then she said, I desire one small petition of thee; I pray thee, say me not nay. And the king said unto her, Ask on, my mother: for I will not say thee nay.

21

And she said, Let Abishag the Shunammite be given to Adonijah thy brother to wife.

22

And king Solomon answered and said unto his mother, And why dost thou ask Abishag the Shunammite for Adonijah? ask for him the kingdom also; for he is mine elder brother; even for him, and for Abiathar the priest, and for Joab the son of Zeruiah.

23

Then king Solomon sware by the Lord, saying, God do so to me, and more also, if Adonijah have not spoken this word against his own life.

24

Now therefore, as the Lord liveth, which hath established me, and set me on the throne of David my father, and who hath made me an house, as he promised, Adonijah shall be put to death this day.

Counter-Arguments

The strongest case that this verse does not belong in this theme.

Christ as High Priest

This verse describes a political interaction between King Solomon and his mother concerning Adonijah's request for Abishag, and mentions Abiathar the priest in a purely narrative context. There is no mention of priesthood, sacrifice, mediation, intercession, or any figure fulfilling or transcending a priestly role, nor any connection to Christ or Melchizedek.