Sahih al-Bukhari 496
Sahih al-Bukhari · Book 8: Prayers (Salat) · What should be the distance between the person offering Salat (prayer) and the Sutra?
Narrated Sahl (bin Sa`d):
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.
The distance between the Musalla of Allah's Messenger (ﷺ) and the wall was just sufficient for a sheep to pass through .