https://abukhadeejah.com/who-first-spoke-with-the-innovation-that-the-speech-of-allaah-is-created-their-isnaad/
Who came with the Innovation (Bid'ah) that the Qur'an is Created and where did they get this Belief from? The link between Jahm bin Safwān and the Magician who played Magic on the Messenger ﷺ.