[١٥٧٣/١] توحيد الصدوق واماليه: أبي، عن سعد، عن اليقطيني قال: كتب أبو الحسن الثالث عليه السلام إلى بعض شيعته ببغداد: بسم الله الرحمن الرحيم، عصمنا الله وإياك من الفتنة، فان يفعل فأعظم بها نعمة، وإلا يفعل فهي الهلكة، نحن نرى أن الجدال في القرآن بدعة، اشترك فيها السائل والمجيب، فتعاطى السائل ما ليس له وتكلف المجيب ما ليس عليه، وليس الخالق إلا الله، وما سواه مخلوق، والقرآن كلام الله، لا تجعل له اسما من عندك، فتكون من الضالين، جعلنا الله وإياك من الذين يخشون ربهم بالغيب، وهم من الساعة مشفقون
[1/1573] Tawhid of al-Saduq and his Amali: My father from Sa’d from al-Yaqtini who said: Abu al-Hasan the Third (i.e. al-Hadi) عليه السلام wrote to one of his Shia in Baghdad:  In the Name of Allah the Beneficent the Merciful. May Allah protect us and you from the Fitna (trial). If He does that then count it a great blessing, and if He does not then it is perdition!  We consider argumentation about the Qur’an to be a Bidʿa (innovation) in which both questioner and respondent have partaken. So the questioner (i.e. who asks about this) has engaged in what is not for him (i.e. his concern) and the respondent has borne what is not on him (i.e. his responsibility to bear).  There is no creator except Allah, and what is other than Him is created. The Qur’an is the Speech of Allah. Do not coin a word for it from yourself so you will become among the astray. May Allah make us and you of those who “fear their Lord without seeing Him and are of the Hour - apprehensive” (21:49)