Again, the same message continued to be presented to others. Do you realize that Paul's instructions to the twelve disciples from Ephesus, that parallel Peters, took place 20 years after Peter's message at Pentecost.
Since you must not have taken the time to examine the accounts associated with the God-given instructions presented by Peter. See the following events:
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 10:44-48 (Gentiles)
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.
Peter's comments to the Jewish Council about the above event:
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, they 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.