When Jesus had thus said, he was troubled in spirit, and testified, and said,
Verily, verily, I say unto you, that one of you shall betray me.
All Commentaries on John 13:21 Go To John 13
Gregory The Dialogist
AD 604
By the time of the day is signified the end of the action. Judas went out in the night to accomplish his perfidy, for which he was never to be pardoned.