Matthew Henry on 1 Kings 2:26-34
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. They therefore come next to be reckoned with. They are both equally guilty of the treason, but, in the judgment passed upon them, a difference is made and with good reason.
I. Abiathar, in consideration of his old services, is only degraded, Kg1 2:26, Kg1 2:27. 1. Solomon convicts him, and by his great…
Read the whole note in the consoleJamieson-Fausset-Brown on 1 Kings 2:26
unto Abiathar the priest said the king--This functionary, as the counsellor or accomplice of Adonijah, had deserved to share his fate. But partly from regard to his priestly dignity, and partly from his long associations with the late king, Solomon pronounced on him the mitigated sentence of banishment to his country estate at Anathoth, and thereby, as God's vicegerent, deprived him of his office and its emoluments. The sacred writer notices the remarkable fulfilment, Abiathar's degradation from the high priesthood (see on Kg1 4:4), of the doom denounced against the house of Eli (Sa1 2:30).
Adam Clarke on 1 Kings 2:27
So Solomon thrust out Abiathar - This was for having taken part before with Adonijah, but by it a remarkable prophecy was fulfilled; see 1 Samuel 2:13-35 (note), and the notes there. God had told Eli that the priesthood should depart from his house; Abiathar was the last of the descendants of Ithamar, of which family was Eli the high priest. Zadok, who was made priest in the stead of Abiathar, was of the family of Eliezer; and by this change the priesthood reverted to its ancient channel. Abiathar deserved this degradation; he supported Adonijah in his unnatural assumption of the royal dignity, even during the life of his father. This was the head and front of his offending.
John Gill on 1 Kings 2:27