After the Savior’s Ascension into the Heavens, the eleven Apostles and the rest of His disciples, the God-loving women who followed after Him from the beginning, His Mother, the most holy Virgin Mary, and His brethren-all together about 120 souls returned from the Mount of Olives to Jerusalem. Entering into the house where they gathered, they went into the upper room, and there they persevered in prayer and supplication, awaiting the coming of the Holy Spirit, as their Divine Teacher had promised them.
Thus, on this day, the seventh Sunday of Pascha, the tenth day after the Ascension and the fiftieth day after Pascha, at the third hour of the day from the rising of the sun, there suddenly came a sound from Heaven, as when a mighty wind blows, and it filled the whole house where the Apostles and the rest with them were gathered. Immediately after the sound, there appeared tongues of fire that divided and rested upon the head of each one. Filled with the Spirit, all those present began speaking not in their native tongue, but in other tongues and dialects, as the Holy Spirit instructed them.
The multitudes that had come together from various places for the feast, most of whom were Jews by race and religion, were called Parthians, Medes, Elamites, and so forth, according to the places where they dwelt. Though they spoke many different tongues, they were present in Jerusalem by divine dispensation. When they heard that sound that came down from Heaven to the place where the disciples of Christ were gathered, all ran together to learn what had taken place. But they were confounded when they came and heard the Apostles speaking in their own tongues. Marveling at this, they said one to another, "Behold, are not all these which speak Galileans? And how hear we every man in our own tongue, wherein we were born?" But others, because of their foolishness and excess of evil, mocked the wonder and said that the Apostles were drunken.
Then Peter stood up with the eleven, and raising his voice, spoke to all the people, proving that that which had taken place was not drunkenness, but the fulfilment of God's promise that had been spoken by the Prophet Joel: "And it shall come to pass in the last days, that I shall pour out of My Spirit upon all flesh, and your sons and daughters shall prophesy" (Joel 2:28), and he preached Jesus of Nazareth unto them, proving in many ways that He is Christ the Lord, Whom the Jews crucified but God raised from the dead. On hearing Peter's teaching, many were smitten with compunction and received the word. Thus, they were baptized, and on that day about three thousand souls were added to the Faith of Christ.
Such, therefore, are the reasons for today's feast: the coming of the All-holy Spirit into the world, the completion of the Lord Jesus Christ's promise, and the fulfilment of the hope of the sacred disciples, which we celebrate today. This is the final feast of the great mystery and dispensation of God's incarnation. On this last, and great, and saving day of Pentecost, the Apostles of the Savior, who were unlearned fishermen, made wise now of a sudden by the Holy Spirit, clearly and with divine authority spoke the heavenly doctrines. They became heralds of the truth and teachers of the whole world. On this day they were ordained and began their apostleship, of which the salvation of those three thousand souls in one day was the comely and marvelous first fruit.