Acts 1:13,14

They went up into an upper room,— This might be rendered into the upper room. There was in Jerusalem an upper room in which the apostles had been used to assemble with their Lord, where they had eaten the last supper with him, and where perhaps they had assembled since his resurrection, and been favoured with his company. Such a room many of the richer and more devout Jews used tohave in their houses for religious exercises. Some say, that this room where the apostles assembled, was upon mount Sion, where Epiphanius asserts there was afterwards a Christian church built: that the gospel should go out from mount Sion, was agreeable to the prophecies, Isaiah 2:3.Micah 4:2. See also the note on Luke 24:52.