This was after the consecration of the Mass, Pope Julius the first declared December 25 as the date to celebrate Christ's birth. (Christmas) in that year, he and the faithful. Walk together in prayer And sung to the Bethlehem district. And to the cave where Jesus was born. When to meet at midnight fit. Pope sacrificed Mizrahi said at the time the property was returned when he hit 3 was dedicated to mass again. And those faithful went back. But there are also many who are not faithful to join in the first place. Pope consecrated the Eucharist, he once again was the third for those faithful. For this reason, the Pope, and he allowed the priest had consecrated the Eucharist three times on Christmas Day. As his practice Since then, the tradition has consecrated Midnight Mass. Christmas And priests can not offer Mass 3 Mass on the occasion of Christmas.