{And one of you is a devil} (kai ex hum(936e) heis diabolos
estin). Jesus does not say that Judas was a devil when he chose
him, but that he is one now. In  13:2,27  John speaks of the
devil entering Judas. How soon the plan to betray Jesus first
entered the heart of Judas we do not know ( 12:4 ). One wonders
if the words of Jesus here did not cut Judas to the quick.