Acts 1:3-11

3 to whom he also presented himself alive after he suffered, with many convincing proofs, appearing to them over a period of forty days and speaking the things about the kingdom of God.
4 And [while he]a was withb [them],c he commanded them, "Do not depart from Jerusalem, but wait for what was promised by the Father, which you heard about from me.
5 For John baptized with water, but you will be baptized with the Holy Spirit {not many days from now}."d

The Ascension

6 So [when]e they had come together, they began askingf him, saying, "Lord, [is it] at this time you are restoring the kingdom to Israel?"
7 But he said to them, "It is not for you to know [the] times or seasons that the Father has set by his own authority.
8 But you will receive power [when]g the Holy Spirit has come upon you, and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the farthest part of the earth."
9 And [after he]h had said these [things], [while]i they were watching, he was taken up, and a cloud received him from their sight.
10 And as they were staring into the sky [while]j he was departing, behold, two men in white clothing stood by them
11 who also said, "Men {of Galilee},k why do you stand there lookingl into the sky? This Jesus who was taken up from you into heaven like this will come back in the same way you saw him departing into heaven!"