Kitab al-Kafi
The issue of Tahreef [tampering] has been a matter of disagreement between many classical Shia scholars. It has been mentioned that the likes of Muhammad Baqir Majlisi (author of Bihar al-Anwar), Muhammad ibn Ya'qub al-Kulayni (author of Kitab al-Kafi), Ni'matullah Al Jazaa'iri (author of Anwar Al Nu'maniyyah, d. 1701) and Al Ayyaashi (author of Tafsir Ayyashi) among others were of the view that the present Qur'an is not the same as was revealed to Muhammad ibn Abdullah and omission/corruption has taken place. Overall, it is claimed that the Shia have more than 1,000 hadiths ascribed to the Shia Imams which indicate the distortion of the Quran.