Is the mentioned narration about the verses of healing authentic, and is there anything similar to it in the authentic Prophetic Hadith?

Al-Alusi mentioned the story of Al-Qushayri who saw Allah Almighty in his dream. Allah commanded him to gather verses of healing and recite them over his sick son, or to write them in a vessel and have his son drink from it. Al-Qushayri did so, and his son was cured. Scholars differed on the permissibility of such an act. Al-Hasan, Al-Nakha'i, and Mujahid prohibited it, while Ibn Al-Musayyab and Malik permitted it, emphasizing that the dispraised nushrah (amulet/charm) is what was practiced in the pre-Islamic era with things whose meanings were unknown.

What is authentically transmitted in the Sunnah is seeking healing with the Quran through blowing or spitting, not by writing it in a vessel and washing it down. Dreams are not a source of legislation; rather, they can be considered if they align with a permissible matter. Indeed, the religion has been perfected, and it is not permissible to innovate what is not part of it.