(51) باب صِفَةِ الْجَنَّةِ وَالنَّارِ
Narrated `Adi bin Hatim:
The Prophet (ﷺ) mentioned the Fire and turned his face aside and asked for Allah's protection from it, and then again he mentioned the Fire and turned his face aside and asked for Allah's protection from it and said, "Protect yourselves from the Hell-Fire, even if with one half of a date, and he who cannot afford that, then (let him do so) by (saying) a good, pleasant word."
Reference: Sahih al-Bukhari 6563
In-book reference: Book 81, Hadith 152
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 76, Hadith 568