Acts 2:1-4

When the day of Pentecost had come, they were all together in one place, and suddenly a sound came from heaven like a rushing violent wind, and it filled the whole house where they were sitting. There appeared to them tongues resembling fire, which were being distributed [among them], and they rested on each one of them [as each person received the Holy Spirit]. And they were all filled [that is, diffused throughout their being] with the Holy Spirit and began to speak in other tongues (different languages), as the Spirit was giving them the ability to speak out [clearly and appropriately].