Baptism of the Holy Spirit

The baptism in the Holy Ghost is a supernatural enduement with power from heaven to equip the Christian for effective witness and service. 
The initial evidence of Holy Spirit Baptism is speaking in unknown tongue as the spirit give utterance. The unknown tongue is a prayer language given to the believer, understood by God but unknown to man. It enables the Christian to build up his own spiritual life by direct and continual communion with God, and is the gateway into a life in which both the gifts and fruits of the Holy Ghost should be manifested. In the New Testament church, this experience was considered normal for all believers. Joel 2:28
Luke 3:16
Acts 2:38-39
Acts 19:2
Mark 16:17