But ye shall receive power after the Holy Spirit is come upon you: and ye shall be witnesses to me, both in Jerusalem, and in all Judea, and in Samaria, and to the uttermost part of the earth.

This Jesus hath God raised up, of which we all are witnesses.

And we are witnesses of all things which he did, both in the land of the Jews, and in Jerusalem; whom they slew and hanged on a tree.

And he was seen many days by them who came up with him from Galilee to Jerusalem, who are his witnesses to the people.

And that repentance and remission of sins should be preached in his name among all nations, beginning at Jerusalem.

And ye also shall bear testimony, because ye have been with me from the beginning.

This is the third time I am coming to you: By the mouth of two or three witnesses shall every word be established.

How shall we escape, if we neglect so great salvation; which at the first began to be spoken by the Lord, and was confirmed to us by them that heard him;

And so

But when the Comforter is come, whom I will send to you from the Father, even the Spirit of truth, who proceedeth from the Father, he will testify concerning me.

Nevertheless, I tell you the truth: It is expedient for you that I depart; for if I go not away, the Comforter will not come to you; but if I depart, I will send him to you.

God also bearing them testimony, both with signs and wonders, and with divers miracles, and gifts of the Holy Spirit, according to his own will?

To whom it was revealed, that not to themselves, but to us they ministered the things which are now reported to you by them that have preached the gospel to you, with the Holy Spirit sent down from heaven; which things the angels desire to look into.

Whom

And they were all filled with the Holy Spirit, and began to speak in other languages, as the Spirit gave them utterance.

While Peter was yet speaking these words, the Holy Spirit fell on all them who heard the word.

(But this he spoke of the Spirit, which they that believe on him should receive, for the Holy Spirit was not yet given, because that Jesus was not yet glorified.)

General references

And when they bring you to the synagogues, and before magistrates, and powers, be not solicitous how or what thing ye shall answer, or what ye shall say:

And ye are witnesses of these things.