After Agabus foretells a famine, the Antioch church sends relief to the believers in Judea by Barnabas and Paul. The two return to Antioch with John Mark.
Sources
Acts 11
27In those days some prophets came down from Jerusalem to Antioch. 28One of them named Agabus stood up and predicted through the Spirit that a great famine would sweep across the whole world. (This happened under Claudius.) 29So the disciples, each according to his ability, decided to send relief to the brothers living in Judea. 30This they did, sending their gifts to the elders with Barnabas and Saul.
Acts 12
25When Barnabas and Saul had fulfilled their mission to Jerusalem, they returned, bringing with them John, also called Mark.