He conspired with Joab son of Zeruiah and with Abiathar the priest. They supported Adonijah,

He has lavishly sacrificed oxen, fattened cattle, and sheep. He invited all the king’s sons, Abiathar the priest, and Joab the commander of the army, but he did not invite your servant Solomon.

For today he went down and lavishly sacrificed oxen, fattened cattle, and sheep. He invited all the sons of the king, the commanders of the army, and Abiathar the priest. And look! They’re eating and drinking in his presence, and they’re saying, ‘Long live King Adonijah!’

He was still speaking when Jonathan son of Abiathar the priest, suddenly arrived. Adonijah said, “Come in, for you are an excellent man, and you must be bringing good news.”

King Solomon answered his mother, “Why are you requesting Abishag the Shunammite for Adonijah? Since he is my elder brother, you might as well ask the kingship for him, for Abiathar the priest, and for Joab son of Zeruiah.”

The king said to Abiathar the priest, “Go to your fields in Anathoth. Even though you deserve to die, I will not put you to death today, since you carried the ark of the Lord God in the presence of my father David and you suffered through all that my father suffered.”

So Solomon banished Abiathar from being the Lord’s priest, and it fulfilled the Lord’s prophecy He had spoken at Shiloh against Eli’s family.

Then the king appointed Benaiah son of Jehoiada in Joab’s place over the army, and he appointed Zadok the priest in Abiathar’s place.

Benaiah son of Jehoiada, in charge of the army;
Zadok and Abiathar, priests;