Reference: Sahih Bukhari (English),Volume 01,03. Knowledge,Hadith 121:- Narrated Abu Huraira: I have memorized two kinds of knowledge from Allah's Apostle . I have propagated one of them to you and if I propagated the second, then my pharynx (throat) would be cut (i.e. killed). - #Hamras -

Reference: Sahih Bukhari (English),Volume 01,03. Knowledge,Hadith 121:- Narrated Abu Huraira: I have memorized two kinds of knowledge from Allah's Apostle . I have propagated one of them to you and if I propagated the second, then my pharynx (throat) would be cut (i.e. killed).