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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.”