Why do you observe the holidays that you do? Why is this question important? Here on this second of a three-part series on the Biblical Holy Days, we’ll be answering those questions. We’ll also explain one of the most misunderstood events found in the Bible.  What happened on the Day of Pentecost?  What does it mean to speak in tongues?  And should Christians be involved with this modern practice as seen in many professing churches today?