1 Kings 1:7

1:7 He collaborated with Joab son of Zeruiah and with Abiathar the priest, and they supported him.

1 Kings 1:25

1:25 For today he has gone down and sacrificed many cattle, steers, and sheep and has invited all the king’s sons, the army commanders, and Abiathar the priest. At this moment they are having a feast in his presence, and they have declared, ‘Long live King Adonijah!’