Found below are all the primary scriptures that discuss baptism and its purpose, followed by some conclusions that are clearly indicated by these texts:

John’s Baptism

Matthew 3:11 (John the Baptist said), ‘Indeed, I baptize you in water [to show your] repentance.’

Luke 3:3, ‘So, he (John the Baptist) went through all the country around the Jordan preaching a baptism of repentance for forgiveness of sins.’

Mark 1:4, ‘John was in the desert; and he came baptizing, preaching a baptism of repentance for the forgiveness of sins. And virtually all those in Judea and from Jerusalem went out to be baptized by him in the Jordan River, as they openly confessed their sins.’

Acts 18:24, 25, ‘Now, a Jew named Apollos (a native of Alexandria), an excellent speaker who knew the scriptures well, arrived at Ephesus. He had been taught the ways of the Lord and was aglow with the Breath [of God]. What he said and taught about Jesus was correct, but he only knew about the baptism of John.

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http://www.2001translation.com/Baptism.htm