Mark 14:43-45

And at once, while He was still speaking, Judas [Iscariot], one of the twelve [disciples], came up, and with him a crowd of men with swords and clubs, who came from the chief priests, the scribes, and the elders [of the Sanhedrin]. [Matt 26:47-56; Luke 22:47-53; John 18:3-11] Now the betrayer had given them a signal, saying, “Whomever I kiss, He is the one; seize Him and lead Him away safely [under guard].” When Judas came, immediately he went up to Jesus and said, “Rabbi (Master)!” and he kissed Him [forcefully].