Jesus predicts his betrayal three times in the New Testament, a narrative which is included in all four Canonical Gospels.[1] This prediction takes place during the Last Supper in Matthew 26:24–25, Mark 14:18–21, Luke 22:21–23, and John 13:21–30.[1]
Before that, in John 6:70, Jesus warns his disciples that one among them is "a devil". In the next verse, the author affirms that Jesus is talking about Judas Iscariot.