Acts 19:1-7 And it came to pass, that, while Apollos was at Corinth, Paul having passed through the upper coasts came to Ephesus: and finding certain disciples, 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. And all the men were about twelve. Why did these 12 disciples at Ephesus need baptism? It is fairly common to posit that there was something wrong with or lacking in John’s baptism (at least after the day of Pentecost). For example, the Easton Illustrated Dictionary states, “John’s Baptism was not Christian baptism...those whom John baptized were rebaptized by Paul.” I don’t believe these disciples were baptized because of a flaw in the baptism of John. Consider: John’s authority was from heaven. Compare Matthew 21:25-27 and John 1:6,33. John the Baptist preached the Holy Ghost (of whom they professed they had not heard). Compare Acts 19:2 & Matthew 3:11. The answer of the Ephesian disciples (v. 3 “Unto John’s baptism”; eis to Ioannou baptisma) implies that they were not actually baptized by John, but by someone following his teachings The apostles (the original ten and Matthias) had only John’s baptism, and were not “rebaptized”. E.g. John 1:35-42; Acts 1:21-22 Apollos, a disciple of John (“knowing only the baptism of John”, Acts 18:25-26) was not “rebaptized”. He only needed further instruction, which he received from Aquilla and Priscilla. These disciples in Ephesus had been baptized by someone who had heard John preach the Messiah and then picked up an incomplete message and ran with it. This person was not authorized to administer John’s baptism. Those who received John’s baptism were supposed to “behold the lamb of God” as John decreased. He did not have a continuing discipleship but was making a people ready for the Lord. All those baptized by him received the counsel of God. It was not wrong to “know only the baptism of John,” but no one else had the right to perpetuate it.