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How did he disclose his betrayer?
Matthew: By an implied affirmative answer to Judas’ question, “Is it I?” “Then Judas which betrayed him, answered and said, Master, is it I? He said unto him, Thou hast said” ([xxvi, 25]).
John: By giving Judas a sop. “Jesus answered, He it is to whom I shall give a sop, when I have dipped it. And when he had dipped the sop, he gave it to Judas Iscariot.”