until one day he notices a bush that seems to be on fire, and yet it's not consumed. and from that bush comes the voice of god. >> and according to tradition, that miraculous bush is still right here today. >> there's the burning bush. what is the structure around it? >> that had to be enclosed when that was engulfed with pilgrims. >> people tried to take bits away? >> a person could reach. >> father justice tells us that st. katherine's, one of the oldest monasteries in the world, has been protecting the bush from relic-hungry pilgrims for more than 15 century. >> are you convinced this is the burning bush? >> we believe this is place that god revealed himself in such an extraordinary way. >> according to the bible, it was at that very moment that god