The word itself indicates “fifty.” Originally it was an Old Testament religious festival, but it took on fresh importance in the New Testament. In Old Testament Israel, the first of the grain harvest was an important event. It meant that the people would have sufficient food for the coming year, and there were great ceremonies surrounding the harvest. Every year, fifty days after the first of the grain was harvested, there would be a festival. Processions of pilgrims would bring baskets of their first fruits to the temple as a thank offering for the harvest. In later Judaism, Pentecost marked another great event, because it was seven weeks after the Passover Sabbath, which was the time to celebrate the giving of the Law at Sinai where God had made a people for Himself.
And now, in the age of the New Covenant, the fifty day period marks a new understanding of a different kind of harvest – a mystical harvest, in which Christ becomes a kind of supernatural grain. His crucifixion and death comprised a new kind of harvest. Christ, the mystical grain, was buried. And fifty days after the promised Seed had been buried in the ground and sprang to life on the third day, there was a harvest festival of the resurrection. Fifty days after His exodus through death into life Jesus gave a new law – the law of love – making for Himself a people, His new Israel, His Holy Catholic Church. That is why we call Pentecost the “birthday of the Church” – it is a day of celebration for the outpouring of the Spirit and the beginning of the spread of the Gospel to all nations. Seven weeks after Christ died and rose from the dead, He breathed the wind and fire of the Holy Spirit upon His Church.
O God, who as at this time didst teach the hearts of thy faithful people, by sending to them the light of thy Holy Spirit: grant us by the same Spirit to have a right judgement in all things, and evermore to rejoice in his holy comfort; through the merits of Christ Jesus thy Son our Lord, who liveth and reigneth with thee, in the unity of the same Holy Spirit, ever one God, world without end. Amen.