What does the Bible say about the Day of Pentecost?

The Day of Pentecost is described in Acts 2 as the moment when the Holy Spirit descended upon the apostles, symbolizing the birth of the Church. It occurred 50 days after Passover, fulfilling the feast of Weeks, which celebrated the harvest. This event marked a significant spiritual harvest where the apostles preached the gospel with power and clarity, leading to the conversion of thousands. It signifies not only the coming of the Holy Spirit but also the beginning of the last days, in which believers would be empowered to witness for Christ.