The first book which I wrote, Theophilus, was concerned with all that Jesus set out to do and teach, 2 until the day came when he was taken up into heaven. He then laid a charge, by the power of the Holy Spirit, on the apostles whom he had chosen. 3 He had shewn them by many proofs that he was still alive, after his passion; throughout the course of forty days he had been appearing to them, and telling them about the kingdom of God; 4 and now he gave them orders, as he shared a meal with them, not to leave Jerusalem, but to wait there for the fulfilment of the Father’s promise. You have heard it, he said, from my own lips; 5 John’s baptism, I told you, was with water, but there is a baptism with the Holy Spirit which you are to receive, not many days from this.

And his companions asked him, Lord, dost thou mean to restore the dominion to Israel here and now? 7 But he told them, It is not for you to know the times and seasons which the Father has fixed by his own authority. 8 Enough for you, that the Holy Spirit will come upon you, and you will receive strength from him; you are to be my witnesses in Jerusalem and throughout Judaea, in Samaria, yes, and to the ends of the earth. 9 When he had said this, they saw him lifted up, and a cloud caught him away from their sight. 10 And as they strained their eyes towards heaven, to watch his journey, all at once two men in white garments were standing at their side. 11 Men of Galilee, they said, why do you stand here looking heavenwards? He who has been taken from you into heaven, this same Jesus, will come back in the same fashion, just as you have watched him going into heaven. 12 Then, from the mountain which is called Olivet, they went back to Jerusalem; the distance from Jerusalem is not great, a sabbath day’s journey. 13 Coming in, they went up into the upper room where they dwelt, Peter and John, James and Andrew, Philip and Thomas, Bartholomew and Matthew, James the son of Alphaeus and Simon the Zealot, and Judas the brother of James. 14 All these, with one mind, gave themselves up to prayer, together with Mary the mother of Jesus, and the rest of the women and his brethren.

-Acts 1:1-26