Acts 12:25

25 And ^aBarnabas and ^aSaul ¹returned ²to Jerusalem, ^bfulfilling their ministry, taking along with them ^cJohn, who was also called Mark.

Acts 13:5

5 And when they reached Salamis, they began to proclaim the word of God in ^athe synagogues of the Jews, and they also had ^bJohn as their helper.