Mark 14:43-46 New International Version (NIV)
43 Just as he was speaking, Judas, one of the Twelve, appeared. With him was a crowd armed with swords and clubs, sent from the chief priests, the teachers of the law, and the elders.
44 Now the betrayer had arranged a signal with them: “The one I kiss is the man; arrest him and lead him away under guard.” 45 Going at once to Jesus, Judas said, “Rabbi!” and kissed him. 46 The men seized Jesus and arrested him.