we read in prophet Joel the Lord’s saying: “And it shall come to pass afterward That I will pour out My Spirit on all flesh; Your sons and your daughters shall prophesy, Your old men shall dream dreams, Your young men shall see visions.” (Joel 2:28)
And this is what happened on the fiftieth day (the Day of Pentecost), as St Peter the Apostle explained this verse from Prophet Joel’s Book (Ac 2:16, 17)