“Why did the Holy Ghost descend on the Jewish Pentecost? Because on their Pentecost the Jews celebrated the anniversary of the giving of the law on Mount Sinai, and God would show by sending the Holy Ghost on this day, that the Old Law had ceased and the New Law commenced. God also chose this time, that the Jews who on this day came together from all countries to Jerusalem to celebrate the Pentecost, might be witness of the miracle, and hear the New Law announced by the apostles. (Feast of Pentecost)” CatholicCatholicismPentecostCatholic SpiritualityCatholic Mass Book:The Church's Year Source: The Church's Year