Acts of the Apostles 1:4-15

Once when he was eating with them, he commanded them, “Do not leave Jerusalem until the Father sends you the gift he promised, as I told you before. John baptized with water, but in just a few days you will be baptized with the Holy Spirit.” So when the apostles were with Jesus, they kept asking him, “Lord, has the time come for you to free Israel and restore our kingdom?” He replied, “The Father alone has the authority to set those dates and times, and they are not for you to know. But you will receive power when the Holy Spirit comes upon you. And you will be my witnesses, telling people about me everywhere—in Jerusalem, throughout Judea, in Samaria, and to the ends of the earth.” After saying this, he was taken up into a cloud while they were watching, and they could no longer see him. As they strained to see him rising into heaven, two white-robed men suddenly stood among them. “Men of Galilee,” they said, “why are you standing here staring into heaven? Jesus has been taken from you into heaven, but someday he will return from heaven in the same way you saw him go!” 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.