The Church's Year
What festival is this?
It is the day on which the Holy Ghost descended in the form of fiery tongues, upon the apostles and disciples, who with Mary, the Mother of Jesus, were assembled in prayer in a house at Jerusalem. (Acts II.)
Why is this day called Pentecost?
The word "Pentecost" is taken from the Greek, and signifies fifty. As St. Jerome explains it, this was the last of the fifty days, commencing with Easter, which the early Christians celebrated as days of rejoicing at the resurrection of the Lord.
Why is this day observed so solemnly?
Because on this day the Holy Ghost, having descended upon the apostles, the law of grace, of purification from sin, and the sanctification of mankind, was for the first time announced to the world; because on this day the apostles, being filled with the Holy Ghost, commenced the work of purifying and sanctifying mankind, by baptizing three thousand persons who were converted by the sermon of St. Peter; and because on this day the Church of Jesus became visible as a community to the world, and publicly professed her faith in her crucified Saviour.
Why did the Holy Ghost descend on the Jewish Pentecost?