John 13:2 reveals the devil had already put betrayal into Judas's heart — the cause behind the troubled announcement here.

John 13:18 quotes the OT prophecy that the betrayer would lift his heel — the very fulfillment Jesus announces here.

John 13:11 states Jesus knew the betrayer, setting the stage for His troubled announcement in v.21.

In John 11:33, Jesus is similarly 'troubled' at Lazarus's death, showing his deep empathy.

In John 12:27, Jesus's soul is troubled before his hour, paralleling his troubled spirit over betrayal.

In John 6:70, Jesus already said one of the twelve is a devil, directly foreshadowing the betrayal here.

Matthew 26:21 records the same announcement of betrayal — a parallel account of the same event.

Mark 14:18 is the parallel account of Jesus saying one disciple will betray him.

Luke 22:21 also records the betrayal announcement, specifying the betrayer's hand on the table.

Luke 22:22 adds that the Son of Man goes as determined but woe to the betrayer — expanding on the same moment.

Acts 1:16 later references the betrayal as Scripture fulfillment, showing the event's aftermath and interpretation.

In Acts 1:17, Peter recalls Judas was numbered among the apostles, echoing the betrayal Jesus predicted here.

Matthew 26:20 describes the same Last Supper setting — Jesus reclining with the twelve, where the betrayal is announced.

In 1 John 2:19, the departure of false believers mirrors Judas's leaving — they were never truly part of the group.