Peter proved that the Pentecost was a fulfillment of the prophecy of
Answer Details
Peter claimed that the events of Pentecost, when the Holy Spirit came upon the disciples and enabled them to speak in various languages, were a fulfillment of the prophecy of Joel. He quoted from Joel 2:28-32 to support his claim, saying that "in the last days" God would pour out his Spirit on all people, and that there would be signs and wonders in the heavens and on the earth.