For the Muslim, it is essential to believe in the holy book of Allah as it is essential to believe in ‘Tauhid’ and ‘Risalat’. This is because it is only possible to know the fundamental aspects of Islam like Allah, Rusul Akhirat etc. through the Kitab .it is not possible to believe in Tauhid and Risalat, Allah and Rasul without believing the Asmanee Kitabv.
References of one hundred and four heavely books can be found. Of them, four are the main and famous books and hundred are Saheefas.