But ye shall receive the virtue of the Holy Spirit which shall come upon you, and ye shall be witnesses unto me both in Jerusalem and in all Judaea and in Samaria and unto the uttermost part of the earth.

This Jesus God has raised up, of whom we all are witnesses.

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

and he was seen many days by those who came up with him from Galilee to Jerusalem, who until now are his witnesses unto the people.

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

and ye also shall bear witness because ye have been with me from the beginning.

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

how shall we escape, if we belittle such great saving health? Which, having begun to be published by the Lord, has been confirmed unto us by those 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, which 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 do not go 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 diverse miracles and gifts of the Holy Spirit, distributing them according to his own will?

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

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

(But this he spoke concerning the Spirit, which those that believe 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 unto the synagogues and unto magistrates and powers, take ye no thought how or what thing ye shall answer or what ye shall say;

And ye are witnesses of these things.