Acts 22:12 And one Ananias, a devout man according to the law, having a good report of all the Jews which dwelt [there], 13 Came unto me, and stood, and said unto me, Brother Saul, receive thy sight. And the same hour I looked up upon him. 14 And he said, The God of our fathers hath chosen thee, that thou shouldest know his will, and see that Just One, and shouldest hear the voice of his mouth. 15 For thou shalt be his witness unto all men of what thou hast seen and heard. 16 And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.
Is it not also of great interest, that Paul thought it necessary to baptise again, those who had been baptised into only John's baptism, before he expected them to receive the Holy Spirit?
Acts 19: Paul having passed through the upper coasts came to Ephesus: and finding certain disciples, 2 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. 3 And he said unto them, Unto what then were ye baptized? And they said, Unto John's baptism. 4 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. 5 When they heard [this], they were baptized in the name of the Lord Jesus.
Acts 9:19 And when he had received meat, he was strengthened. Then was Saul certain days with the disciples which were at Damascus. 20 And straightway he preached Christ in the synagogues, that he is the Son of God. 21 But all that heard [him] were amazed, and said; Is not this he that destroyed them which called on this name in Jerusalem, and came hither for that intent, that he might bring them bound unto the chief priests? 22 But Saul increased the more in strength, and confounded the Jews which dwelt at Damascus, proving that this is very Christ.
'confounded the Jews' seems to indicate that not all were sympathetic to the changes required by faith in Christ.