(51) باب صِفَةِ الْجَنَّةِ وَالنَّارِ
Narrated Abu Huraira:
The Prophet (ﷺ) said, "The width between the two shoulders of a Kafir (disbeliever) will be equal to the distance covered by a fast rider inthree days."
Reference: Sahih al-Bukhari 6551
In-book reference: Book 81, Hadith 140
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 76, Hadith 558