I was reading the Gospel of John and I read a verse that called my attention.
In John 3:5 Jesus talks about two baptisms:
"Jesus answered: Amen, amen I say to thee, unless a man be born again of water and the Holy Ghost, he cannot enter into the kingdom of God."
The baptism of water and the baptism of the Holy Ghost. Some may say that the water and the Holy Ghost means only one baptism and that baptism consists in the substance of water plus the coming of the Holy Ghost. But in Acts 8:14-17 we have this:
"Now when the apostles, who were in Jerusalem, had heard that Samaria had received the word of God, they sent unto them Peter and John.
Who, when they were come, prayed for them, that they might receive the Holy Ghost.
For he was not as yet come upon any of them; but they were only baptized in the name of the Lord Jesus.
Then they laid their hands upon them, and they received the Holy Ghost."
See that they were baptized in the name of the Lord Jesus, probably refering to the baptism of water, but they didn't have the Holy Ghost. Just after a process of Laying Hands that they received the Holy Ghost.
The same process of laying hands can be also seem in of Acts 9:17:
"And Ananias went his way, and entered into the house. And laying his hands upon him, he said: Brother Saul, the Lord Jesus hath sent me, he that appeared to thee in the way as thou camest; that thou mayest receive thy sight, and be filled with the Holy Ghost."
Now I have some questions. Why those people didn't receive the Holy Ghost through laying hands right after they were baptized?
Maybe Jesus was refering to the sacrament of Confirmation that consists of laying hands too. But if this is true wouldn't the Confirmation also be necessary for salvation? The context of the passage is that Jesus was talking that is needed of the man to born again in order to be saved and to born again the Lord meant born again of water and the Holy Ghost.