King 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.”
Here is, I. Solomon's accession to the throne, Kg1 2:12. He came to it much more easily and peaceably than David did, and much sooner saw his government established. It is happy for a kingdom when the end of one good reign is the beginning of another, as it was here. II. His just and necessary removal of Adonijah his rival, in order to the establishment of his throne.
Commenting on 1 Kings 2:12-25
Then King Solomon sware by the Lord,.... To prevent his mother pressing him to have her petition granted: saying, God do so to me, and more also; lay such and such evils upon me, and more than I care to express: if Adonijah have not spoken this word against his own life; to his own prejudice, and even to the loss of his life; in...
why dost thou ask Abishag . . . ask for him the kingdom also--(See on Sa2 16:5; also see on Sa2 12:8). Solomon's indignation was roused; he in a moment penetrated the artful scheme, and from his associating the names of Abiathar and Joab, he seems to have suspected or known that those deep schemers had been the prompters of Adonijah.