Acts 1:6

3 And to whom he gave clear and certain signs that he was living, after his death; for he was seen by them for forty days, and gave them teaching about the kingdom of God:

4 And when they were all together, with him, he gave them orders not to go away from Jerusalem, but to keep there, waiting till the word of the Father was put into effect, of which, he said, I have given you knowledge:

5 For the baptism of John was with water, but you will have baptism with the Holy Spirit, after a little time.

6 So, when they were together, they said to him, Lord, will you at this time give back the kingdom to Israel?

7 And he said to them, It is not for you to have knowledge of the time and the order of events which the Father has kept in his control.

8 But you will have power, when the Holy Spirit has come on you; and you will be my witnesses in Jerusalem and all Judaea and Samaria, and to the ends of the earth.

9 And when he had said these things, while they were looking, he was taken up, and went from their view into a cloud.