Matthew 4:12 first reports John's imprisonment, explaining why John is now in prison and hearing about Jesus' deeds.

Matthew 14:3 gives the full account of Herod arresting John because of Herodias—the reason John is imprisoned when he sends his disciples here.

Matthew 17:12 identifies John as Elijah who has come. This confirms John’s forerunner role, deepening the irony of his doubt in prison.

Mark 6:17 provides the parallel account of Herod's order to arrest John for marrying Herodias, confirming the context of John's imprisonment here.

Luke 3:19 reveals that John was imprisoned for rebuking Herod about Herodias—the cause of his confinement mentioned here.

Luke 7:18-23 recounts the same episode of John's disciples asking Jesus whether he is the Messiah, paralleling this verse directly.

Mark 1:14 dates Jesus’ public preaching to after John’s imprisonment. This gives chronological context to John hearing about Jesus’ deeds from prison.

Mark 9:12 speaks of Elijah coming first to restore all things, pointing to John. This reinforces his preparatory mission, making his uncertainty more poignant.

John 3:24 notes that John was not yet imprisoned during earlier events, contrasting with his imprisonment here and clarifying the timeline.

John 4:1 notes Jesus baptizing more disciples than John. This explains the shift in ministry prominence that John hears about while imprisoned.

Acts 2:22 declares Jesus’ miracles as divine endorsement. This confirms the ‘deeds of the Messiah’ John heard about were legitimate works of God.