For the third time St. Michael appeared and ordered him to enter the grotto: “It is not necessary that you dedicate this church that I have consecrated with my presence. Enter and pray with my assistance and celebrate the Sacrifice. I will show you how I have consecrated this place.” The Bishop finally obeyed. Upon entering the grotto he found an altar covered with a red cloth and a crystal cross upon it while at the entrance the imprint of an infantile foot confirmed the presence of the Archangel Michael.

The Bishop had a chapel built at the entrance to the grotto and dedicated it on the 29th of September, now kept as the feast of the Archangel Michael, Raphael and Gabriel. The grotto is the only place of cult which is not consecrated by the hand of man. The title of ‘celestial Basilica’ was conferred during the centuries.