John 12:33
This he said, signifying what death he should die.
Cross-references
John 12:24
Parallel
John 12:24 provides the 'kernel of wheat' metaphor that explains why Jesus' death is necessary for life, directly connecting to the 'kind of death' he will die.
John 18:32
Prophetic fulfillment
John 18:32 explicitly fulfills this prediction by identifying the kind of death Jesus would die, confirming the earlier statement.
John 21:19
Parallel
John 21:19 uses identical phrasing to describe Peter's death, echoing the same formula of indicating the kind of death.
Luke 23:33
Prophetic fulfillment
Luke 23:33 narrates the actual crucifixion, fulfilling the prediction of the kind of death Jesus would die.