My father narrated to us. He said: Sa`d b. `Abdullah narrated to us. He said: Muhammad b. `Isa b. `Ubayd al-Yaqtini narrated to us. He said: `Ali b. Muhammad b. `Ali b. Musa al-Rida wrote to one of his Shi`a in Baghdad:

In the name of Allah, the Beneficent, the Merciful. May Allah protect us and you from sedition, for if He does, then it will be a great blessing! If He does not, then that is perdition. We see the argumentation regarding the [createdness of the] Quran as an innovation (bid`a) in which the questioner and the answerer are partners in. The questioner engages in that which is not his [to engage in], and the answerer assigns [to himself] that which is not incumbent to him. There is no creator but Allah, and everything other than Him is created. The Quran is the words of Allah, so do not give it a name from yourself, lest you be from the misguided. May Allah make us and you of those who fear their Lord with regards to the unseen, as they are in awe of the Hour.