Quoting,
John 20:21-22 records that Jesus after His resurrection first appeared to His disciples in a group:
"Jesus said to them, "Peace to you! As the Father has sent Me, I also send you." And when He had said this, He breathed on them, and said to them, "Receive the Holy Spirit."
More literally verse 22 could be rendered, "He breathed "into" them and said to them, "Receive Holy Breath." His actions were suited to His words. At that moment the disciples received from Jesus the Holy Spirit as divine Breath. They were, in fact, born again of the Holy Spirit. They received divine resurrection life - life that had triumphed over Satan, sin, death and the grave.
It is in the light of this that the apostle says in I John 5:4: "Whatever is born of God overcomes the world." There is no power in the universe that can defeat the divine, eternal life of God received by every believer in Jesus who is born again of the Spirit.
But the disciples still had more to receive of the Holy Spirit. In the forty-day period between the resurrection and ascension of Jesus,
He commanded them not to depart from Jerusalem, but to wait for the Promise of the Father, "which," He said, "you have heard from Me; for John truly baptized with water, but you shall be baptized with the Holy Spirit not many days from now." (Acts 1:4-5)
Clearly the baptism in the Holy Spirit was something that still lay ahead for the disciples, even after their experience on Resurrection Sunday.
The fulfillment of this promise of Jesus is recorded in Acts 2:1-4:
"When the Day of Pentecost had fully come, they were all with one accord in one place. And suddenly there came a sound from heaven, as of a rushing mighty wind, and it filled the whole house where they were sitting. Then there appeared to them divided tongues, as of fire, and one sat upon each of them. And they were filled with the Holy Spirit and began to speak with other tongues, as the Spirit gave them utterance.
There were three successive phases in the experience described above. First, there was a "baptism," an immersion. They were all immersed in the Holy Spirit coming down over them from above. This could perhaps be described as a "Niagara Falls" baptism.
Second, there was an "infilling." They were all individually filled with the Holy Spirit.
Third, there was an "overflow." The Holy Spirit within them overflowed through them in supernatural speech. They glorified God in languages they had not learned and did not understand.
The experience of the disciples on the Day of Pentecost demonstrated the principle stated by Jesus in Matthew 12;34: "For out of the abundance of the heart the mouth speaks." When the heart is full, in other words, it overflows through the mouth in speech.
The experience of the Holy Spirit was to appropriate supernatural equipment to make the disciples effective as witnesses for Jesus. They were to be witnesses to events that were totally supernatural: the resurrection and ascension of Jesus. The testimony to such events required supernatural power., which was first manifested on the Day of Pentecost and continued throughout the record of the book of Acts.
This power has never been withdrawn from the Church and is still available today.
(From "Bought with Blood: The Divine Exchange at the Cross" - by Derek Prince. Ch 18 - "Possessing Our Possessions." Pg 223-225)