April 25, 31 AD is CrucifixionDay .<br>
The next day (April 26) was Passover .  50 days after Passover is Pentecost . 
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There are 4 days in April after the 26th.  There are 31 days in May.  The 15th of June would be 50 days after Passover (4+31+15).  
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 CrucifixionDay was Nissan 14 31 AD.  Sivan 8 is 50 days after Nissan 14 (14+28+8).
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That would make the original day of Pentecost Sunday June 15, 31 AD.
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So, we should celebrate the outpouring of the HolySpirit on June 15th each year.
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On the original Pentecost Moses received the 10 Commandments , came down from Mt, Sinai, found the children of Israel worshipping a golden calf and 3000 people died.
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On the day of Pentecost when the Disciples were together in the upper room, they were are filled with the HolySpirit , Peter preached to the public and 3000 people received Jesus Christ as Savior .
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