Acts 15:36-39

36 After a few days of this, Paul said to Barnabas, "Let's go back and visit all our friends in each of the towns where we preached the Word of God. Let's see how they're doing."

37 Barnabas wanted to take John along, the John nicknamed Mark.

38 But Paul wouldn't have him; he wasn't about to take along a quitter who, as soon as the going got tough, had jumped ship on them in Pamphylia.

39 Tempers flared, and they ended up going their separate ways: Barnabas took Mark and sailed for Cyprus;