no i dont have actuall proof in writting, it is not something documented on paper, but it is a statemt from my sheikh. it is like the hadith where the prophet pbuh said that knowldge will be removed from the ummat by death of religous people. we know that this is true but can even non sufis document the specific time when this removal occured. according to our seniors it occured straight after the 10 hijri. the destruction of the ummat u see today started in from the 10th hijri.