Jesus said when Holy Spirit comes, He will "bear witness of Me", and "guide you into all the truth". John 15:26 and 16:13.
So, does Holy Spirit bear witness of Christ before or after a person believes?
Well, if you read the context, Jesus is speaking to his disciples here. They were believers, but they had not received the Holy Spirit as Jesus was not yet glorified.
John 7:37 In the last day, that great day of the feast, Jesus stood and cried, saying, If any man thirst, let him come unto me, and drink.
38 He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.
39 (But this spake he of the Spirit, which they that believe on him should receive: for the Holy Ghost was not yet given; because that Jesus was not yet glorified.)
And we know that after Jesus was crucified, and before he ascended to heaven he told the apostles and disciples to wait for the Holy Spirit.
Acts 1:1 The former treatise have I made, O Theophilus, of all that Jesus began both to do and teach,
2 Until the day in which he was taken up, after that he through the Holy Ghost had given commandments unto the apostles whom he had chosen:
3 To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God:
4 And, being assembled together with them, commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, which, saith he, ye have heard of me.
5 For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence.
John 7:37-39 explains that a person does not receive the Holy Ghost or Spirit until they believe. And in the book of Acts these believers did receive the Holy Spirit just as Jesus promised.
And we have some believers in Acts who are clearly identified as believers who had not yet received the Holy Spirit.
Acts 8:12 But when they
believed Philip preaching the things concerning the kingdom of God, and the name of Jesus Christ, they were baptized, both men and women.
These people believed and were baptized. But they had not received the Holy Ghost.
Acts 8:14 Now when the apostles which were at Jerusalem heard that Samaria
had received the word of God, they sent unto them Peter and John:
15 Who, when they were come down, prayed for them, that they might receive the Holy Ghost:
16 (For as yet he was fallen upon none of them: only they were baptized in the name of the Lord Jesus.)
17 Then laid they their hands on them, and they received the Holy Ghost
So, once again we see the pattern of believeing before receiving the Holy Ghost. And here is one more example
Acts 19:1 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,
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.
6 And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied.
So, now I have shown you from scripture several times that a person first must believe on Jesus and then afterward receives the Holy Ghost.
Are you convinced from the scriptures? Or will you continue to believe the false teachings of men?