oh, yeah-speaking in tongues IS BY ALL MEANS biblical.. Acts 2: 1 Shortly after Christ had risen into heaven, his disciples were observing the annual festival of Pentecost (Acts 2:1). "Suddenly a sound like the blowing of a violent wind came from heaven and filled the whole house where they were sitting. They saw what seemed to be tongues of fire that separated and came to rest on each of them. All of them were filled with the Holy Spirit and began to speak in other tongues as the Spirit enabled them" (verses 2-4).