Mahdi (pbuh) is explained in a concealed manner in Surah Al-Qahf, in Surah Yusuf, in the story of the Prophet Solomon (pbuh), in the 55th verse of Surat An-Nur and in many other verses of the Qur’an. In fact this is a characteristic of Mahdi (pbuh); he is the concealed one. - Harun Yahya