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

This Jesus has 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 of them who came up with him from Galilee to Jerusalem, who are his witnesses unto the people.

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

And you also shall bear witness, because you have been with me from the beginning.

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

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

And so

But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, who proceeds from the Father, he shall testify of me:

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

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

Unto whom it was revealed, that not unto themselves, but unto us they did minister the things, which are now reported unto you by them that have preached the gospel unto 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 with other tongues, as the Spirit gave them utterance.

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

(But this spoke he of the Spirit, whom 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 unto the synagogues, and unto magistrates, and powers, take you no thought how or what thing you shall answer, or what you shall say:

And you are witnesses of these things.