Then came David to Nob to Ahimelech the priest: and Ahimelech came to meet David trembling, and said to him, Why are you alone, and no man with you?
Mark 2:26 speaks of Abiathar as the officiating priest in this episode; and two explanations are offered.  (1) Keil supposed that, "The error was due to a lapse of memory in which Ahimelech was confounded with Abiathar."[7]  (2) Young writes that, "It is possible that Ahimelech's son Abiathar might have acted as coadjutor to his father as did the sons of Eli  (1 Samuel 4:4)."[8]  This habit of turning things over to the sons was well established in Eli's family; and therefore we like Young's explanation as the better one.