 One of the four authorized copies of the Quran was kept here, and the head of Yahya ibn Zakariyya (John the Baptist, son of Zechariah) is believed to be in the shrine.One of the minarets is dedicated to Jesus, and it is believed he will return to it to judge the world, and assist a figure called "Al-Mahdi".It is believed that after the end of the world prayers will continue for forty years in the mosque, and that prayers in the mosque are considered to be equal to those offered in Jerusalem.