Pentecost: the Birth of the Church
The Greek name for the Jewish Feast of Weeks, deriving from its occurrence 50 days after Passover (Acts 20:16; 1 Cor 16:8). Because the early Christians received the baptism of the Holy Spirit on this day, the term is now more commonly used to refer to that event recounted in Acts 2:1–13.
The Feast of Weeks was the second of the three great Jewish feasts. Its name signified that it concluded the period of seven weeks which began with the presentation of the first sheaf of the barley harvest during the Passover celebration (Lev 23:15–16; Deut 16:9). Thus it was originally an agricultural feast marking the end of the grain harvest and was celebrated during the month of Sivan (May/June).
According to Acts, the apostles remained in Jerusalem after the Resurrection appearances. On the day of Pentecost they were gathered in one house when the Holy Spirit came upon them, sounding like a mighty wind and appearing like tongues of fire upon each of them. Then the apostles began miraculously to speak in foreign languages, attracting the attention of foreign Jews who were amazed to hear their native languages spoken by Galileans. This set the stage for Peter’s sermon which resulted in the conversion and baptism of about 3000 people (Acts 2:1–47).