This is a miracle–that many children and adults have never heard of–which has been reoccurring for many centuries and continues even to this day.
On the Eve of the Resurrection, inside the tomb of Christ in Jerusalem, the Holy Fire descends on the Patriarch of Jerusalem from within the Holy Sepulcher and believers pass the light around to all the faithful, who usually hold 33 candles bound together, to signify the 33 years of Christ’s ministry on the Earth. The fire is miraculously given but also miraculous in nature, because it does not burn, just as Moses and the Burning bush. Believers prove this by passing their hands and faces through the fire. Also, it’s color is different than normal fire, as it has a white-blue hue. The Holy Fire also bounces around in a way that is different than a regular light. Interestingly, believers have seen the Fire ignite unlit oil lamps spontaneously.
Here are some articles about the Holy Fire: