[1563/2] الكافي: علي بن إبراهيم، عن أبيه، عن ابن أبي عمير، عن عمر بن اذينة، عن الفضيل بن يسار قال: قلت لابي عبدالله عليه السلام: إن الناس يقولون: إن القرآن نزل على سبعة أحرف، فقال: كذبوا أعداء الله ولكنه نزل على حرف واحد من عند الواحد
[1563/2] al-Kafi: Ali b. Ibrahim from his father from Ibn Abi Umayr from Umar b. Udhayna from al-Fudhayl b. Yasar who said: I said to Abi Abdillah عليه السلام: The people say that the Qur’an came down upon seven Ahruf? So he (i.e. the Imam) said: The enemies of Allah have lied! Rather it came down upon one Harf from the One
Shaykh Asif al-Mohseni
Muʿjam al-Aḥādīth al-Muʿtabara
al-Muhsini: That the Qur’an came down in seven Ahruf and even though it is found in the books of the A’mma (i.e. Sunnis) its meaning is not understood (even by them), secondly, it contradicts historical reality, and thirdly, it negates the miracle of the Qur’an and its challenge (i.e. to bring something like it). More details about this is sought in the appropriate sources, see for instance the book ‘Nadhara Abira ila al-Sihah al-Sitta’.