Mary: Mother of Mark and Sister of Barnabas
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Acts 12:12
And when he had realized this, he went to the house of Mary the mother of John, also called Mark, where many people had gathered together and were praying.
Colossians 4:10
My fellow prisoner Aristarchus sends you greetings, as does Mark the cousin of Barnabas. You have already received instructions about him: If he comes to you, welcome him.