Acts 18
24 Now a Jew named Apollos, a native of Alexandria, came to Ephesus. He was an eloquent man, well versed in the scriptures. 25 He had been instructed in the way of the Lord; and being fervent in spirit, he spoke and taught accurately the things concerning Jesus, though he knew only the baptism of John.
Acts 19
1 While Apollos was at Corinth, Paul passed through the upper country and came to Ephesus. There he found some disciples. 2 And he said to them, “Did you receive the Holy Spirit when you believed?” And they said, “No, we have never even heard that there is a Holy Spirit.” 3 And he said, “Into what then were you baptized?” They said, “Into John’s baptism.” 4 And Paul said, “John baptized with the baptism of repentance, telling the people to believe in the one who was to come after him, that is, Jesus.” 5 On hearing this, they were baptized in the name of the Lord Jesus.
scripturecatholic.com/baptism.html#baptism-III
home.inreach.com/bstanley/baptism.htm
communionofsaints.net/sacraments/baptism.html