Acts 19:1-5

While Apollos was in Corinth, Paul went through the inland regions and came to Ephesus. He found some disciples there  and said to them, “Did you receive the Holy Spirit when you believed?” They replied, “No, we have not even heard that there is a Holy Spirit.”  So Paul said, “Into what then were you baptized?” “Into John’s baptism,” they replied.  Paul said, “John baptized with a baptism of repentance, telling the people to believe in the one who was to come after him, that is, in Jesus.”  When they heard this, they were baptized in the name of the Lord Jesus,

The Holy Spirit is our seal in Christ Jesus, and it is by the name of Jesus alone that the Holy Spirit makes His residence within us. The Holy Spirit comes and brings conviction, He intercedes for us when we do not know what to pray, He enables and strengthens us as we go forth and preach the gospel. John the Baptist’s baptism only served to point people to Jesus Christ. These disciples no longer need that baptism, because one greater has emerged. There is no one who is greater than Jesus, and no other who is able to save us.