Mary, mother of John Mark

Mary the mother of John Mark was one of the earliest of Jesus's disciples. She was the sister of Barnabas (Col. 4:10), and joined with him in disposing of their land and giving the proceeds of the sale into the treasury of the Church (Acts 4:37; 12:12). Her house in Jerusalem was the common meeting-place for the disciples there.

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Initial text from Easton's Bible Dictionary, 1897 -- Please update as needed