Mark 2:26 Commentary - Whedon's Commentary on the Old and New Testaments
26. In the days of Abiathar the high priest It appears by the account of the transaction here referred to in 1Sa 21:1, that Ahimelech, father of Abiathar, was the high priest who supplied David the showbread. His son Abiathar was then priest, and afterward high priest; and as such under David attained a celebrity in Jewish history. Jesus, therefore, specifies the time as being the period of Abiathar’s life and office, who afterward became high priest. It is by no means improbable, though there is no other proof than arises from this passage, that Abiathar may have been high priest with his father, as he was high priest a part of his life conjointly with Zadock. There would be no extraordinary error, however, in saying that the American Constitution was formed in the time of President Washington.
Consult other comments:
Mark 2:26 - Abbott's Illustrated New Testament
Mark 2:26 - The Greek Testament
Mark 2:26 - The Cambridge Bible for Schools and Colleges
Mark 2:26 - Adam Clarke's Commentary and Critical Notes on the Bible
Mark 2:26 - Commentary on the Holy Bible by Thomas Coke
Mark 2:26 - Companion Bible Notes, Appendices and Graphics
Mark 2:26 - Ellicott's Commentary for English Readers (Old and New Testaments)
Mark 2:26 - The Expositor’s Greek Testament by Robertson
Mark 2:26 - Garner-Howes Baptist Commentary
Mark 2:26 - Geneva Bible Notes
Mark 2:26 - John Gill's Exposition of the Entire Bible
Mark 2:26 - Gnomon of the New Testament
Mark 2:26 - Henry Alford's Greek Testament
Mark 2:26 - Lightfoot Commentary Gospels
Mark 2:26 - Old and New Testaments Restoration Commentary
Mark 2:26 - Robertson's Word Pictures in the New Testament
Mark 2:26 - A Popular Commentary on the New Testament
Mark 2:26 - Scofield Reference Bible Notes
Mark 2:26 - John Trapp's Complete Commentary (Old and New Testaments)
Mark 2:26 - The Treasury of Scripture Knowledge
Mark 2:26 - Vincent's Word Studies in the New Testament
Mark 2:26 - Whedon's Commentary on the Old and New Testaments
Whedon's Commentary on the Old and New Testaments

Daniel D. Whedon (1808-1885) was a prominent university professor, theologian, and author. He served as Professor of Ancient Languages at Wesleyan University in Connecticut; as Professor of Rhetoric at the University of Michigan; and as editor of the Methodist Quarterly Review from 1856 to1884. He authored numerous books including Commentary on the New Testament (New York: Carlton & Porter, 1860); Commentary on the Old Testament (New York: Nelson & Phillips, 1873); What is Arminianism? (Toronto: W. Briggs, 1879); and Essays, Reviews, and Discourses (New York: Phillips & Hunt, 1887).