Sahih al-Bukhari, Volume 1, Book 9, Hadith 475 (USC-MSA) ⓘ
Narrated Sahl (bin Sa`d): The distance between the Musalla of Allah's Messenger and the wall was just sufficient for a sheep to pass through.
حَدَّثَنَا عَمْرُو بْنُ زُرَارَةَ، قَالَ أَخْبَرَنَا عَبْدُ الْعَزِيزِ بْنُ أَبِي حَازِمٍ، عَنْ أَبِيهِ، عَنْ سَهْلٍ، قَالَ كَانَ بَيْنَ مُصَلَّى رَسُولِ اللَّهِ صلى الله عليه وسلم وَبَيْنَ الْجِدَارِ مَمَرُّ الشَّاةِ.
also referenced under: Book 8, Hadith 143 (In-Book) & Hadith 496 (DarusSalam)