Suddenly a loud sound filled the house where they were meeting. It sounded like a great wind blowing.
Then something that looked like tongues of fire appeared, then separated and sat on each of them.
They began speaking in other languages. The Holy Spirit was causing them to talk to the others in languages which they had never learned!
The wind sound was so loud that people ran to see what was happening, and when they heard the men speaking in their own languages, they were amazed.
Some thought the men were drunk, but that was unlikely because it was only 9:00 in the morning.
Peter stood up with the eleven apostles and began to preach to the crowd.
He told them how that Jesus of Nazareth had come, and how that God had shown his approval of Jesus by the signs and miracles that he had performed while he was on earth.
Peter accused the crowd of handing Jesus over to wicked men to be crucified, but God raised him from the dead, and he was seen alive by many people.
When the people in the crowd realized what they had done, they were so sorry, and they asked Peter and the other apostles, "Brothers, what shall we do?"
Peter told them to repent; to be truly sorry for what they had done, and for every one of them to be baptized in the name of Jesus so that their sins might be forgiven. He said if they would do that, they would receive God's gift to them, the Holy Spirit, to live within them.
Those who heard his words and accepted them, were baptized, and about 3,000 people did just that.