37Barnabas wanted to take John, also called Mark.
38But Paul thought it best not to take him, because he had deserted them in Pamphylia and had not accompanied them in the work.
— Acts 15:37-38

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Article by Phil Ware

There are two kinds of faithful leaders, groups, and churches. Which are you? Phil Ware shares with us two kinds of early leaders and churches and groups, Paul and Barnabas become examples of those kinds of churches; each is faithful, takes risks, and faces opposition from the evil one.