Acts 12:25; Acts 15:37-38

25 And Barnabas and Saul returned from Jerusalem, when they had fulfilled their ministry, and took with them John, whose surname was Mark.
37 And Barnabas determined to take with them John, whose surname was Mark. 38 But Paul thought not good to take him with them, who departed from them from Pamphylia, and went not with them to the work.
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