(42) باب حِفْظِ الْعِلْمِ
Narrated Abu Huraira:
I have memorized two kinds of knowledge from Allah's Messenger (ﷺ) . I have propagated one of them to you and if I propagated the second, then my pharynx (throat) would be cut (i.e. killed).
Reference: Sahih al-Bukhari 120
In-book reference: Book 3, Hadith 62
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 3, Hadith 121