“But you shall receive power when the Holy Spirit has come upon you; and you shall be witnesses to Me.”
(Acts 1:8)
"When the Day of Pentecost had fully come, they were all with one accord in one place. And suddenly there came a sound from heaven, as of a rushing mighty wind, and it filled the whole house where they were sitting. Then there appeared to them divided tongues, as of fire, and one sat upon each of them. And they were all filled with the Holy Spirit…"
(Acts 2:1-4)
"The Counselor, the Holy Spirit, whom the Father will send in my name, he will teach you all things, and bring to your remembrance all that I have said to you"
(John 14:26).
Saint Mark explicitly mentions the promise to enable them "to speak in new tongues"
(Mark 16:17).
Christ is risen from the dead, trampling down death by death and upon those in the tombs bestowing life.
Glory to the Father and the Son, and the Holy Spirit, now and ever and unto the ages of ages. Amen.Greek Hymn: Khristos Anesti
The Pentecost Feast, Or the Settlement of the Holy Spirit, is one of the Major Master’s Feasts, and is considered as the Church's Birthday. It is prayed in the morning with the joyous rite, then all people gather in the afternoon and “The Pentecostal Prostrations” are prayed.
There is History to this name; it goes back to what happened with St. Macarius the Pope of Antioch, when a strong wind blew, and so all the people knelt down, right after which the wind calmed down, but whenever the people stood up, the wind blew again, so they knew that God’s will is that these prayers should be done in prostration and reverence.The Kenonia App
In our daily prayer in the Orthodox Creed we say: "We believe in the Holy Spirit, the Lord, the Giver of Life, Who proceeds from the Father, Who with the Father and the Son, is worshipped and glorified, Who spoke by the prophets."
The Orthodox Creed