but you are going to receive power when the Holy Spirit comes upon you, and you must be witnesses for me in Jerusalem and all over Judea and Samaria, and to the very ends of the earth."

I mean Jesus whom God raised from the dead, to which fact we are all witnesses,

We are witnesses of everything that He did in the country of the Jews and in Jerusalem. Yet they murdered Him by hanging Him upon a tree.

and for many days He appeared to those who had come up with Him from Galilee to Jerusalem, and they are now witnesses for Him to the people.

and that in His name repentance as the condition for the forgiveness of sins should be preached to all the nations. Beginning at Jerusalem

And you too are to bear testimony to me, because you have been with me from the start."

This is my third visit to you. Any charge preferred must be sustained by the evidence of two or three witnesses.

how can we escape, if we pay no attention at all to a salvation that is so great? This is so because it was first proclaimed by the Lord Himself, and then it was proved to us to be valid by the very men who heard Him themselves,

And so

"When the Helper comes whom I will send from the Father to you, the Spirit of truth that comes from the Father, He will testify to me.

Yet it is nothing but the truth I now tell you, that it is better for you that I should go away. For if I do not go away, the Helper will not come into close fellowship with you, but if I do go away, I will send Him to be in close fellowship with you.

while God continued to confirm their testimony with signs, marvels, and various sorts of wonder-works, and with gifts of the Holy Spirit distributed in accordance with His will.

It was made known to them that they were serving not themselves but you, in their searching for these things that have already been told to you by those who through the Holy Spirit sent from heaven brought you the good news. The angels long to take a peep into these things.

Whom

and they were all filled with the Holy Spirit, and began to speak in foreign languages as the Spirit granted them to utter divine things.

While Peter was still speaking these truths, the Holy Spirit fell upon all who were listening to the message.

By this He referred to the Spirit that those believing in Him were going to receive -- for the Spirit had not yet come, because Jesus had not yet been glorified.

General references

Now when they are bringing you before the synagogues or the magistrates or the authorities, never worry about how to defend yourselves, or what to say,

you are to continue as witnesses to these things.