Acts 1:5 For John baptized with water, but in a few days you will be baptized with the Holy Spirit.
The first baptism of a believer is through the medium of water and involves a human baptizer. John’s baptism in water was a common experience of the earliest disciples. After Christ ascended, the early church baptized followers in symbolic reference to the death, burial and resurrection of Jesus.
Jesus was about to leave the earth and wanted to ensure that his followers were immersed in God’s Spirit. The Holy Spirit would be the earthly representative of the Godhead alive within each disciple.
This second baptism did not use water. The immersion would be into God’s Spirit. While human hands would be involved in prayer to receive the Holy Spirit, Jesus would be the baptizer. Acts 2 and a handful of other accounts tell of the early church members being baptized in the Holy Spirit. Not only did people become disciples in an act of conversion, they experienced a second event where they were baptized in the Holy Spirit.