Verses with the word betrayeth in the New Testament (3 verses):

Mark 14:42
Rise up, let us go; lo, he that betrayeth me is at hand.

Luke 22:21
But, behold, the hand of him that betrayeth me is with me on the table.

John 21:20
Then Peter, turning about, seeth the disciple whom Jesus loved following; which also leaned on his breast at supper, and said, Lord, which is he that betrayeth thee?