Mark 14:45
Going at once to Jesus, Judas said, rabbi! and kissed him — the rabbi address is the disciples' standard respectful title for Jesus, used here as the cover for betrayal. The kiss (katephilēsen, he kissed him warmly, possibly repeatedly) is the full enactment of the signal. The intimacy of the greeting makes the betrayal's violence more acute: the warmest greeting becomes the mechanism of the arrest.