Siman 74

(15.) Pertaining to the Aleph-Beis [Sefer HaMidos — the Book of Attributes], regarding the matter of healing inscribed elsewhere: he said that he had in the Aleph-Beis under the letter Resh [for refu'ah — healing] all the remedies — there was written there the healing for every illness in the world, and not a single illness existed for which its healing was not written there. But he did not wish to copy it, and he burned it.