7 He said to them: “It is not for you to know the times or dates the Father has set by his own authority.
8 But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.”
9 After he said this, he was taken up before their very eyes, and a cloud hid him from their sight.
10 They were looking intently up into the sky as he was going, when suddenly two men dressed in white stood beside them.
11 “Men of Galilee,” they said, “why do you stand here looking into the sky? This same Jesus, who has been taken from you into heaven, will come back in the same way you have seen him go into heaven.”

Matthias Chosen to Replace Judas

12 Then the apostles returned to Jerusalem from the hill called the Mount of Olives, a Sabbath day’s walka from the city.
13 When they arrived, they went upstairs to the room where they were staying. Those present were Peter, John, James and Andrew; Philip and Thomas, Bartholomew and Matthew; James son of Alphaeus and Simon the Zealot, and Judas son of James.
14 They all joined together constantly in prayer, along with the women and Mary the mother of Jesus, and with his brothers.
15 In those days Peter stood up among the believers (a group numbering about a hundred and twenty)
16 and said, “Brothers and sisters,b the Scripture had to be fulfilled in which the Holy Spirit spoke long ago through David concerning Judas, who served as guide for those who arrested Jesus.
17 He was one of our number and shared in our ministry.”