Acts 12:12 And when he had considered [the thing], he came to the house of Mary the mother of John, whose surname was Mark; where many were gathered together praying.
Acts 12:25 And Barnabas and Saul returned from Jerusalem, when they had fulfilled [their] ministry, and took with them John, whose surname was Mark.
Acts 13:5 And when they were at Salamis, they preached the word of God in the synagogues of the Jews: and they had also John to [their] minister.
Acts 13:13 Now when Paul and his company loosed from Paphos, they came to Perga in Pamphylia: and John departing from them returned to Jerusalem.