Again, history does not bear this out. John was preaching repentance and baptism long before Pentecost. Even God called for repentance in the OT.
“‘Do I have any pleasure at all that the wicked should die?’ says the Lord GOD, ‘and not that he should turn from his ways and live?’” (Ezek 18:23).
“‘For I have no pleasure in the death of one who dies,’ says the Lord GOD. ‘Therefore turn and live!’” (Ezek 18:32).
I agree, John the Baptist introduced baptism of repentance for remission of sin. However, after Jesus death, burial and resurrection a change took place regarding water baptism. The NT command of water baptism was administered in the name of Jesus as it specifically related to His sacrifice. Water baptism in the name of Jesus for remission of one's sin and receiving the Holy Ghost is required of everyone as the scriptures below reveal. Also consider the relevance of Apostle Paul preaching this over 20+ years after Pentecost. (Acts 19:1-7)
Acts 2:38-39 (Jewish) The group did not receive the Holy Ghost the moment they believed in Jesus. However, they were told they could expect the Holy Ghost at some point.
Then Peter said unto them,
Repent, and
be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall
receive the gift of the Holy Ghost.
For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call.
Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls.
Acts 8:12-17 (Samaritans-half Jewish-half Gentile)
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.
Then Simon himself believed also: and when he was baptized, he continued with Philip, and wondered, beholding the miracles and signs which were done.
Now when the apostles which were at Jerusalem heard that Samaria had received the word of God, they sent unto them Peter and John:
Who, when they were come down, prayed for them, that they might receive the Holy Ghost:
(For as yet he was fallen upon none of them: only
they were baptized in the name of the Lord Jesus.)
Then laid they their hands on them,
and they received the Holy Ghost.
Acts 10:43-48 (Gentiles)
To him give all the prophets witness, that
through his name whosoever believeth in him shall receive remission of sins.
While Peter yet spake these words, the Holy Ghost fell on all them which heard the word.
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.
For they heard them speak with tongues, and magnify God. Then answered Peter,
Can any man forbid water, that these should not be baptized, which have received the Holy Ghost as well as we?
And
he commanded them to be baptized in the name of the Lord. Then prayed they him to tarry certain days.
Acts 11:13-14
And he shewed us how he had seen an angel in his house, which stood and said unto him, Send men to Joppa, and call for Simon, whose surname is Peter;
Who shall tell thee words, whereby thou and all thy house shall be saved.
Acts 19:2-6 (Disciples who did not realize they had to water baptized in Jesus name)
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.
And he said unto them, Unto what then were ye baptized? And they said, Unto John's baptism.
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.
When they heard this, t
hey were baptized in the name of the Lord Jesus.
And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied.
Acts 22:14-16 (Paul's water baptism)
And he said, The God of our fathers hath chosen thee, that thou shouldest know his will, and see that Just One, and shouldest hear the voice of his mouth.
For thou shalt be his witness unto all men of what thou hast seen and heard.
And now why tarriest thou? arise, and
be baptized, and wash away thy sins, calling on the name of the Lord.