Mark 14:44
Now the betrayer had arranged a signal with them: the one I kiss is the man; arrest him and lead him away under guard — the kiss as the arranged signal is the intimate betrayal's identifying mechanism. In a torch-lit night garden, the crowd cannot reliably identify Jesus; Judas provides the identification through the greeting sign of a close friend. The intimate sign (a kiss) used for betrayal is the deepest possible exploitation of friendship.