"I will pour out of my Spirit upon all flesh..."

The Great Feast of Pentecost (source)

  

Rejoice then and be glad, ye children of Sion, in the Lord your God: for he has given you food fully, and he will rain on you the early and the latter rain, as before. And the floors shall be filled with corn, and the presses shall overflow with wine and oil. And I will recompense you for the years which the locust, and the caterpillar, and the palmerworm, and the cankerworm have eaten, even my great army, which I sent against you. And ye shall eat abundantly, and be satisfied, and shall praise the name of the Lord your God for the things which he has wrought wonderfully with you: and my people shall not be ashamed for ever. And ye shall know that I am in the midst of Israel, and that I am the Lord your God, and that there is none else beside me; and my people shall no more be ashamed for ever. And it shall come to pass afterward, that I will pour out of my Spirit upon all flesh; and your sons and your daughters shall prophesy, and your old men shall dream dreams, and your young men shall see visions. And on my servants and on my handmaids in those days will I pour out of my Spirit. And I will shew wonders in heaven, and upon the earth, blood, and fire, and vapor of smoke. The sun shall be turned into darkness, and the moon into blood, before the great and glorious day of the Lord come. And it shall come to pass that whosoever shall call on the name of the Lord shall be saved.

-Joel 2:23-32, Read at the Great Vespers for the Feast of Pentecost

(source)

  

The Holy Prophet Joel, holding a scroll with his famous prophecy: "I will pour out my Spirit upon all flesh..." (source)

  

Through the prayers of our Holy Fathers, Lord Jesus Christ our God, have mercy on us and save us! Amen!