Speaking in tongues by the disciples at Pentecost was the fulfillment of a prophecy by

The prophecy about speaking in tongues by the disciples at Pentecost was fulfilled by the prophet Joel. Joel had prophesied that in the last days, God would pour out His Spirit on all people, and they would prophesy, dream dreams, and see visions. The prophecy also mentioned that God's people would speak in different languages and that whoever called on the name of the Lord would be saved. On the day of Pentecost, the Holy Spirit descended on the disciples, and they began to speak in different languages, just as Joel had prophesied. This event was a sign that the last days had begun and that God was pouring out His Spirit on His people, just as Joel had foretold. Therefore, the speaking in tongues by the disciples at Pentecost was the fulfillment of the prophecy by Joel.