The baptism of the Holy Spirit as an historical event.
First, it was a definite promise to the Apostles. He would come at a definite time:
[FONT="]John 14:16 And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever;[/FONT]
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[FONT="]John 14:26 But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.[/FONT]
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[FONT="]John 15:26 But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me:[/FONT]
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[FONT="]John 16:12 I have yet many things to say unto you, but ye cannot bear them now.[/FONT]
[FONT="]13 Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.[/FONT]
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[FONT="]The command to wait:[/FONT]
[FONT="]Acts 1:4 And, being assembled together with them, commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, which, saith he, ye have heard of me.[/FONT]
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[FONT="]Acts 1:5 For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence.[/FONT]
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[FONT="]Acts 1:8 But ye shall receive power, after that the Holy Ghost is 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.[/FONT]
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They go to Jerusalem as commanded, and they wait there.
[FONT="]Acts 1:12 Then returned they unto Jerusalem from the mount called Olivet, which is from Jerusalem a sabbath day's journey.[/FONT]
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[FONT="]They go to an upper room and pray (probably in the Temple somewhere).
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[FONT="]Acts 1:13 And when they were come in, they went up into an upper room, where abode both Peter, and James, and John, and Andrew, Philip, and Thomas, Bartholomew, and Matthew, James the son of Alphaeus, and Simon Zelotes, and Judas the brother of James.[/FONT]
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Then on the next day, the Day of Pentecost comes:
[FONT="]Acts 2:1 And when the day of Pentecost was fully come, they were all with one accord in one place.[/FONT]
[FONT="]2 And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting.[/FONT]
[FONT="]3 And there appeared unto them cloven tongues like as of fire, and it sat upon each of them.[/FONT]
[FONT="]4 And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.[/FONT]
--This is a historical event never again to be repeated in history.
There was a promise specifically given to them in the gospels.
There was a command in Acts 1 to wait in Jerusalem.
Finally, on the Day of Pentecost, according to the promise given, and the command obeyed, the Holy Spirit came, as the Lord said He would.
This will never again happen in history; never again happened in the Book of Acts. It is a one time event. Similar events happened in Acts 10 and 19, but nothing like this ever happened again in all of history.