According to Shia beliefs, Nafs-e-Zakiyyah is a sign that will occur before Muhammad al-Mahdi’s appearance, who will be killed between Rukn and Maqame Ibrahim (Position of Ibrahim) in the ambit of Ka’ba.[9] Al-Irshad contains biographies of each of the fourteen infallibles and says the reappearance of Muhammad al-Mahdi will occur at an interval of 15 days after this event.[10]