New Defender's Study Bible Notes
2:26 Abiathar the high priest. Jesus knew that Abiathar’s father Ahimelich was still high priest at this time (see I Samuel 21:1-6). However, Abiathar was no doubt present at the time, and soon thereafter became high priest under David. The account here by Mark simply says that this event occurred in the time of Abiathar, not necessarily in the time when he served as high priest.