Acts 15:37

And when he realized this, he went to the house of Mary, the mother of John who was also called Mark, where many were gathered together and were praying.

And there was such a sharp disagreement that they separated from one another, and Barnabas took Mark with him and sailed away to Cyprus.

and they have been told about you, that you are teaching all the Jews who are among the Gentiles to forsake Moses, telling them not to circumcise their children nor to walk according to the customs.

Was any man called when he was already circumcised? He is not to become uncircumcised. Has anyone been called in uncircumcision? He is not to be circumcised.

Aristarchus, my fellow prisoner, sends you his greetings; and also Mark, the cousin of Barnabas (about whom you received instructions; if he comes to you, welcome him);

Only Luke is with me. Pick up Mark and bring him with you, for he is useful to me for service.

as do Mark, Aristarchus, Demas, Luke, my fellow workers.

She who is in Babylon, chosen together with you, sends you greetings, and so does my son, Mark.