When Peter realized this, he went to the house of Mary, the mother of John Mark, where many people had gathered together and were praying.

So Barnabas and Saul returned to Jerusalem when they had completed their mission, bringing along with them John Mark.

Barnabas wanted to bring John called Mark along with them too,

They had a sharp disagreement, so that they parted company. Barnabas took along Mark and sailed away to Cyprus,