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At the Last Supper did Jesus pass the cup once, or twice?
Matthew and Mark: Once ([Matt. xxvi, 26–30]; [Mark xiv, 16–26]).
Luke: Twice ([xxii, 13–20]).
Regarding this discrepancy, Scribners’ “Bible Dictionary” says: “The temptation to expand was much stronger than to contract; and the double mention of the cup raises real difficulties of the kind which suggest interpolation.”