Pentecost: The Birth of the Church
Πεντηκοστή — Pentēkostē · pen-tay-kos-TEE
In brief
Pentecost is the day the Holy Spirit descended upon the apostles in Jerusalem, fifty days after the Resurrection, and the Church was born. Gathered in one place, the disciples heard a sound like a rushing wind, saw what looked like tongues of fire rest upon each of them, and began to proclaim the mighty works of God in languages they had never learned. That same day about three thousand people were baptized. What had been a frightened band of followers became the living Body of Christ, filled with the Spirit and sent to the whole world.
The fiftieth day
The name comes from the Greek for "fiftieth." Pentecost was already a Jewish feast — the Feast of Weeks, kept fifty days after Passover as a harvest festival and a remembrance of the giving of the Law at Sinai. Jerusalem was crowded with pilgrims. The apostles had gathered together, waiting as the risen Christ had commanded them: they were not to leave the city until they were "endued with power from on high" (Luke 24:49) — the promised gift of the Holy Spirit (Acts 1:4-8).
On that morning, the Book of Acts records, a sound like a rushing mighty wind filled the house, tongues "like as of fire" appeared and rested on each one of them, and they were all filled with the Holy Spirit and began to speak in other tongues. The fire that rested on them recalls the burning bush that was not consumed: the Spirit does not destroy but transfigures, and He came not as a single flame over the group but personally, upon each. The Church has understood this as the fulfillment of the whole work of Christ — the gift He had promised now poured out.
The Church is born
The crowd, hearing Galileans speak in their own native languages, was amazed and bewildered. Peter — the same Peter who had denied Christ weeks before — stood up and preached the first Christian sermon, proclaiming Jesus crucified and risen. His hearers were "pricked in their heart" and asked what they should do; Peter answered, repent and be baptized. About three thousand were added that day (Acts 2:41). A community that had numbered a few dozen became, in an afternoon, a Church.
This is why Pentecost is called the birthday of the Church. The Body of Christ, formed in the Incarnation and gathered at the Cross and Resurrection, is now animated by the Holy Spirit who gives it life. The tradition often reads the day as the reversal of Babel: where once human pride scattered the nations into mutually unintelligible tongues, the Spirit now gathers them back, not by erasing their languages but by making one confession heard in all of them. From this moment the Church exists as what it will always be — a communion of many peoples united in one faith.
The Spirit who remains
Pentecost is not merely a founding event sealed in the past. The same Spirit given to the apostles continues to be given in the Church: every newly baptized Christian is sealed with the Holy Spirit in chrismation, which the Fathers call a personal Pentecost. The Holy Spirit remains the one who sanctifies, who consecrates the gifts at the Liturgy, and who guides the Church into all truth.
Pentecost also sets the Church in motion. The Spirit is given not for private comfort but for mission: "ye shall be witnesses unto me... unto the uttermost part of the earth" (Acts 1:8). What follows immediately is the age of the apostles, scattering across the Roman world to preach. The Church keeps the day each year as a great feast, celebrated fifty days after Pascha; that liturgical celebration, with its kneeling prayers and its churches decked in green, is treated in the entry on the feast of Pentecost.