But you shall receive power, the Holy Spirit coming upon you. And you shall be witnesses to Me both in Jerusalem and in all Judea, and in Samaria, and to the end of the earth.

God raised up this Jesus, 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. They killed Him and hanged Him on a tree;

who appeared for many days by those 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 proclaimed in His name among all nations, beginning at Jerusalem.

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

I am coming to you this third time. In the mouth of two or three witnesses every word shall 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 those who heard Him;

And so

And when the Comforter has come, whom I will send to you from the Father, the Spirit of truth who proceeds from the Father, He shall testify of Me.

But I tell you the truth, it is expedient for you that I go away; for if I do not go away, the Comforter will not come to you. But if I depart, I will send Him to you.

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

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

Whom

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

While Peter was still speaking these words, the Holy Spirit fell on all those hearing the Word.

(But He spoke this about the Spirit, which they who believed on Him should receive; for the Holy Spirit was not yet given, because Jesus was not yet glorified.)

General references

And when they bring you into the synagogues, and to rulers and authorities, take no thought as to how or what thing you shall answer, or what you shall say.

And you are witnesses of these things.