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.
 

12:12 many were gathered together. This was most likely the same upper room where they had been praying before the coming of the Holy Spirit on the day of Pentecost (Acts 1:13), and where they had observed the last supper with the Lord (Luke 22:12). Mark had probably been in the house with them both times.

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