Acts 1 : 1-11
In the first part of my work, Theophilus, I wrote of all that Jesus did and taught from the beginning until the day when He ascended to heaven. But first He had instructed through the Holy Spirit the apostles He had chosen. After His passion, He presented Himself to them, giving many signs that He was alive; over a period of forty days He appeared to them and taught them concerning the Kingdom of God.
Once when He had been eating with them, He told them, “Do not leave Jerusalem but wait for the fulfillment of the Father’s promise about which I have spoken to you : ‘John baptised with water, but you will be baptised with the Holy Spirit within a few days.'”
When they had come together, they asked Him, “Is it now that You will restore the Kingdom of Israel?” And He answered, “It is not for you to know the time and the steps that the Father has fixed by His own authority. But you will receive power when the Holy Spirit comes upon you; and you will be My witnesses in Jerusalem, throughout Judea and Samaria, even to the ends of the earth.”
After Jesus said this, He was taken up before their eyes and a cloud hid Him from their sight. While they were still looking up to heaven where He went, suddenly, two men dressed in white stood beside them and said, “Men of Galilee, why do you stand here looking up at the sky? This Jesus who has been taken from you into heaven, will return in the same way as you have seen Him go there.”