Acts 15:36-39

36 After some time, Paul said to Barnabas, "We should go back to all those towns where we preached the message of the Lord. Let's visit the believers and see how they are doing."

37 Barnabas wanted to take John Mark with them,

38 but he had left them at Pamphylia; he did not continue with them in the work. So Paul did not think it was a good idea to take him.

39 Paul and Barnabas had such a serious argument about this that they separated and went different ways. Barnabas took Mark and sailed to Cyprus,