So Benaiah son of Jehoiada went up, struck down Joab, and killed him. He was buried at his own home in the wilderness.
Abiathar and Joab were both aiding and abetting in Adonijah's rebellious attempt, and it is probable were at the bottom of this new motion made of Adonijah for Abishag, and it should seem Solomon knew it, Kg1 2:22. This was, in both, an intolerable affront both to God and to the government, and the worse because of their high station and the great influence their examples might have upon many.
Commenting on 1 Kings 2:26-34
And the king put Benaiah the son of Jehoiada in his room over the host,.... Advanced him from being captain of his bodyguards to be general of the army: and Zadok the priest did he put in the room of Abiathar; from a common priest he promoted him to the high priesthood; whereby that office was restored to its ancient line, the family or Eleazar...
JOAB SLAIN. (1Ki. 2:28-45) Then tidings came to Joab--The execution of these sentences respectively on Adonijah and Abiathar prepared Joab for his fate. Death, due to his great crimes (Num 35:33), would long ago have been inflicted, had not his power and popularity with the army been too formidable for the old king.
Commenting on 1 Kings 2:28-45