John the Baptist said:
Matt 3:11 I indeed baptize you with water unto repentance: but he that cometh after me is mightier than I, whose shoes I am not worthy to bear: he shall baptize you with the Holy Ghost, and with fire:
Jesus said:
Luke 24:49 And, behold, I send the promise of my Father upon you: but tarry ye in the city of Jerusalem, until ye be endued with power from on high.
Acts 1:1 The former treatise have I made, O Theophilus, of all that Jesus began both to do and teach, 2 Until the day in which he was taken up, after that he through the Holy Ghost had given commandments unto the apostles whom he had chosen: 3 To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God: 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. 5 For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence.
The day of Pentecost
Acts 2:1 And when the day of Pentecost was fully come, they were all with one accord in one place. 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. 3 And there appeared unto them cloven tongues like as of fire, and it sat upon each of them. 4 And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.
The Samaritans received
Acts 8:12 But when they believed Philip preaching the things concerning the kingdom of God, and the name of Jesus Christ, they were baptized, both men and women. 13 Then Simon himself believed also: and when he was baptized, he continued with Philip, and wondered, beholding the miracles and signs which were done. 14 Now when the apostles which were at Jerusalem heard that Samaria had received the word of God, they sent unto them Peter and John: 15 Who, when they were come down, prayed for them, that they might receive the Holy Ghost: 16 (For as yet he was fallen upon none of them: only they were baptized in the name of the Lord Jesus.) 17 Then laid they their hands on them, and they received the Holy Ghost.
The Gentiles receive
Acts 10:44 While Peter yet spake these words, the Holy Ghost fell on all them which heard the word. 45 And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost. 46 For they heard them speak with tongues, and magnify God.
Acts 11:14 Who shall tell thee words, whereby thou and all thy house shall be saved. 15 And as I began to speak, the Holy Ghost fell on them, as on us at the beginning. 16 Then remembered I the word of the Lord, how that he said, John indeed baptized with water; but ye shall be baptized with the Holy Ghost. 17 Forasmuch then as God gave them the like gift as he did unto us, who believed on the Lord Jesus Christ; what was I, that I could withstand God? 18 When they heard these things, they held their peace, and glorified God, saying, Then hath God also to the Gentiles granted repentance unto life.
Acts 19:1 And it came to pass, that, while Apollos was at Corinth, Paul having passed through the upper coasts came to Ephesus: and finding certain disciples, 2 He said unto them, Have ye received the Holy Ghost since ye believed? And they said unto him, We have not so much as heard whether there be any Holy Ghost. 3 And he said unto them, Unto what then were ye baptized? And they said, Unto John's baptism. 4 Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe on him which should come after him, that is, on Christ Jesus. 5 When they heard this, they were baptized in the name of the Lord Jesus. 6 And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied.
These scriptures lay out the basic understanding that the baptism in the Holy Spirit is important, planned for and for all people. We see John the Baptist proclaiming the ministry of Jesus, we see Jesus telling the disciples to wait for it, and we see it poured out on the Jew, the Samaritan as well as the Gentiles!
In every case there was a manifestation which showed those around what had happened. It is specifically associated with speaking in tongues in all but one, and there was a clear though not strictly spoken manifestation which was like that at the first (Acts 2:4).
So read the extended account of each of these, only the most salient part is copied here. Look at the context and total picture to see that speaking on tongues is clearly the manifestation of Holy Ghost Baptism.
There is so much more to say about the manifestation of the Holy Ghost, expect to see more in a subsequent posting