But ye will receive power when the Holy Spirit hath come upon you; and ye will be my witnesses, both in Jerusalem and in all Judaea, and in Samaria, and to the end of the earth.

This Jesus God raised up, whereof we all are witnesses.

And we are witnesses of all things which he did both in the country of the Jews and in Jerusalem; whom they also slew by hanging him on a cross.

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

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

And ye also are witnesses, because ye 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 salvation, which at the first was spoken through the Lord, and was confirmed to us through those who heard him,

And so

When the Comforter is come, whom I will send to you from the Father, the Spirit of truth, which proceedeth from the Father, he will bear witness of me.

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

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

to whom it was revealed, that not to themselves, but to you, they were ministering the things, which have now been announced to you by them that have brought the glad tidings to you by the Holy Spirit sent down from heaven; which things angels desire to look into.

Whom

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

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

But this he said of the Spirit, which those that believed in him were to receive; for the Spirit was not yet, because Jesus was not yet glorified.

General references

And when they bring you to the synagogues and the magistrates and the authorities, be not anxious as to how or what ye shall answer, or what ye shall say;

Ye are witnesses of these things.