When did the Pentecost first take place?

The Pentecost first took place approximately 50 days after the resurrection of Jesus Christ, as described in the New Testament. This event is traditionally celebrated on the Jewish feast of Shavuot, which occurs 50 days after Passover. During Pentecost, the Holy Spirit descended upon the apostles, empowering them to speak in various languages and marking the birth of the Christian Church. This event is recorded in the Book of Acts, chapter 2.