It is a gift of power from God. When one receives the gift of the Holy Ghost, one will experience the Bible evidence as the disciples did on the day of Pentecost, speaking in other tongues as the spirit gave utterance. Reference: Acts 2:4
The Pentecostal baptism of the Holy Ghost and Fire is obtainable by a definite act of appropriating faith on the part of the fully cleansed believer.
“And these signs shall follow them that believe; they shall speak with new tongues” (Mark 16:17).
“And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied” (Acts 19:6). Reference: Luke 24:49, Matthew 3:11, St. John 7:38-39