Although Christians have celebrated Christmas and Easter for centuries, the Church has paid little attention to Pentecost and many (if not most) Christians would have a hard time describing what Pentecost refers to and why it matters to us today. In this teaching we look at the Old Testament background of the Feast of Pentecost and tie it together with the special things God wanted to accomplish on the Day of Pentecost that took place shortly after Jesus Christ’s crucifixion, resurrection and ascension. These things ushered in a new spiritual administration, making available things God and mankind had been waiting for across thousands of years and making it “the birthday of the Christian Church”.