Abdul'baha explained this.
Bahá'í Reference Library - Some Answered Questions, Pages 106-107
To me this is the moment that the Disciples connected with the Spirit of Faith and realised that Christ never dies and is more than flesh.
That inspiration was Christ, the Holy Spirit.
Regards Tony
The Baha'i quote:
After the death of Christ the disciples were troubled, and their ideas and thoughts were discordant and contradictory; later they became firm and united, and at the feast of Pentecost they gathered together and detached themselves from the things of this world. Disregarding themselves, they renounced their comfort and worldly happiness, sacrificing their body and soul to the Beloved, abandoning their houses, and becoming wanderers and homeless, even forgetting their own existence. Then they received the help of God, and the power of the Holy Spirit became manifested..
Acts chapter 2:
When the Day of Pentecost had fully come, they were all with one accord in one place. 2 And suddenly there came a sound from heaven, as of a rushing mighty wind, and it filled the whole house where they were sitting. 3 Then there appeared to them divided tongues, as of fire, and one sat upon each of them. 4 And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit gave them utterance.
Supposedly, Jesus had already appeared to them for several days and many of them supposedly watched him ascend into the sky. Jesus promised this Holy Spirit and here he is. Abdul Baha ignores that they saw "tongues" of fire and they began speaking in foreign languages.
Later in the chapter Peter speaking:
32 This Jesus God has raised up, of which we are all witnesses. 33 Therefore being exalted to the right hand of God, and having received from the Father the promise of the Holy Spirit, He poured out this which you now see and hear.
In context the NT says that Jesus rose from the dead. Something that Peter says that he and the other apostles witnessed. That Jesus promised the Holy Spirit would come. And, what the people were witnessing there that day was the pouring out of that Spirit.
Abdul Baha says a lot of nice sounding things, while at the same time bypassing what the NT writers really said. What's so difficult to believe that God brought Jesus back to life and then filled his followers with his Spirit? If modern people today fall for it, oops, I mean believe it, just think how it was 2000 years ago. People today get hands laid on them and start speaking gibberish, oops, again, I mean, they start speaking in tongues. Supposedly people heard these Christians and understood them in their native tongues.
That's all part of this story. Apparently, along with not believing Jesus rose physically from the dead, Baha'is don't believe that Christian get filled with the Holy Spirit. But, 2000 years ago, what would you do? Why would you doubt that Jesus did all these things? If you felt the love of God in your heart, why wouldn't you think it is the Holy Spirit living in you? Now a days, forget about it. It all sounds like stuff of fairytales. It's not logical and not rational. But, for Baha'is to say that those people only "symbolically" saw Jesus alive after being crucified, and that they only "symbolically" saw tongues of fire, how logical or rational is that?
Luke writing all this stuff is nothing but a liar. It didn't happen. Jesus is dead and Christians lied about it. They said they witnessed him as being alive? No, they are lying. The writers are not trying to be symbolic. They were telling of events that they claim really happened. If they didn't... they are liars. But, Baha'is can't have that. They need something from the NT to be true. Like the Comforter being Muhammad and Baha'u'llah. They need the Three Woes to be Muhammad, The Bab and Baha'u'llah. But anything that they can't use for their purposes has to be only "symbolic"?
Fine, then do the same with Greek mythology and the Greek religion. I'm sure you can. Or, the Egyptian religion and its mythology. Or, were those false religions and really... only mythology? Sorry, but I have to agree with Paul. If Jesus hasn't risen from the dead, Christianity is a useless religion. It is filled with false hopes and beliefs. It is mythology that some poor suckers took to be true then added even more false beliefs and forced it on to people. I don't know if Baha'is realize how close they sound to saying something just like that.