Final answer:
At the beginning of Acts 2, the Holy Spirit descended upon the Apostles during the Jewish holiday of Pentecost. The Holy Spirit inspired the Apostles to preach about Jesus Christ in different languages. This event marked the birth of the early Christian church and the empowerment of the Apostles to spread the message.
Step-by-step explanation:
At the beginning of Acts 2, the Holy Spirit descended upon the Apostles during the Jewish holiday of Pentecost. This event is described in the Bible and is sometimes represented as tongues of fire. The Holy Spirit inspired the Apostles to preach about Jesus Christ in different languages so that everyone could understand. This event marked the birth of the early Christian church and the empowerment of the Apostles to spread the message of Christianity.