Mark 14:44-45
Now the one who turned Him over to the Jewish leaders [i.e., Judas] had given them a signal, saying, "Whoever I give a kiss [of greeting] to, he is the one; arrest him and lead him away under guard."
Luke 6:16
Judas, the son of James [i.e., the same as Thaddaeus. See Matt. 10:3] and Judas Iscariot, who became a traitor [to Jesus].
Luke 22:47-48
While He was still speaking suddenly one of the twelve apostles, named Judas, [who was] leading a crowd, came near Jesus to kiss Him.
John 13:18
"I am not talking about all of you; for I know the ones I have chosen [i.e., which of the twelve apostles would be faithful]. But let the Scripture [Psa. 41:9] be fulfilled [that says], 'The person who eats with me has [viciously] turned against me.'