Jesus reiterates why it was unnecessary for Judas to betray him.

"Am I leading a rebellion," said Jesus, "that you have come out with swords and clubs to capture me? Every day I was with you, teaching in the temple courts, and you did not arrest me. But the Scriptures must be fulfilled." Mark 14: 48-49

We mentioned this peculiarity in commentary after this entry regarding Judas' alleged betrayal.