Original Verse:
Acts Chapter 12 Verse 25Barnabas and Saul returned to Jerusalem, when they had fulfilled their service, also taking with them John whose surname was Mark.

Reference Verses:
Acts Chapter 4 Verse 36Joses, who by the apostles was surnamed Barnabas (which is, being interpreted, Son of Encouragement), a Levite, a man of Cyprus by race,
Acts Chapter 9 Verse 27But Barnabas took him, and brought him to the apostles, and declared to them how he had seen the Lord in the way, and that he had spoken to him, and how at Damascus he had preached boldly in the name of Jesus.
Acts Chapter 11 Verse 22The report concerning them came to the ears of the assembly which was in Jerusalem. They sent out Barnabas to go as far as Antioch,
Acts Chapter 11 Verse 30which they also did, sending it to the elders by the hands of Barnabas and Saul.
Acts Chapter 12 Verse 12Thinking about that, he came to the house of Mary, the mother of John whose surname was Mark, where many were gathered together and were praying.
Acts Chapter 13 Verse 5When they were at Salamis, they proclaimed the word of God in the Jewish synagogues. They had also John as their attendant.
Acts Chapter 13 Verse 13Now Paul and his company set sail from Paphos, and came to Perga in Pamphylia. John departed from them and returned to Jerusalem.
Acts Chapter 15 Verse 37Barnabas planned to take John, who was called Mark, with them also.
Acts Chapter 15 Verse 39Then the contention grew so sharp that they separated from each other. Barnabas took Mark with him, and sailed away to Cyprus,
Colossians Chapter 4 Verse 10Aristarchus, my fellow prisoner, greets you, and Mark, the cousin of Barnabas (concerning whom you received commandments, "if he comes to you, receive him"),
2nd Timothy Chapter 4 Verse 11Only Luke is with me. Take Mark, and bring him with you, for he is useful to me for service.
Philemon Chapter 1 Verse 24as do Mark, Aristarchus, Demas, and Luke, my fellow workers.
1st Peter Chapter 5 Verse 13She who is in Babylon, chosen together with you, greets you; and so does Mark, my son.
Acts Chapter 15 Verse 35But Paul and Barnabas stayed in Antioch, teaching and preaching the word of the Lord, with many others also.