Acts of the Apostles 1:12-15

Then the apostles returned to Jerusalem from the Mount of Olives, a distance of half a mile. When they arrived, they went to the upstairs room of the house where they were staying. Here are the names of those who were present: Peter, John, James, Andrew, Philip, Thomas, Bartholomew, Matthew, James (son of Alphaeus), Simon (the zealot), and Judas (son of James). They all met together and were constantly united in prayer, along with Mary the mother of Jesus, several other women, and the brothers of Jesus. During this time, when about 120 believers were together in one place, Peter stood up and addressed them.