Language:
كتاب الصلاة
8  
Prayers (Salat)
(90)
Chapter: The Sutra of the Imam is also a Sutra for those who are behind him
(90)
باب سُتْرَةُ الإِمَامِ سُتْرَةُ مَنْ خَلْفَهُ
Sahih al-Bukhari 495

Narrated `Aun bin Abi Juhaifa:

I heard my father saying, "The Prophet (ﷺ) led us, and prayed a two-rak`at Zuhr prayer and then a tworak` at `Asr prayer at Al-Batha' [??] with a short spear (planted) in front of him (as a Sutra) while women and donkeys were passing in front of him (beyond that stick).

حَدَّثَنَا أَبُو الْوَلِيدِ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ عَوْنِ بْنِ أَبِي جُحَيْفَةَ، قَالَ سَمِعْتُ أَبِي أَنَّ النَّبِيَّ صلى الله عليه وسلم صَلَّى بِهِمْ بِالْبَطْحَاءِ ـ وَبَيْنَ يَدَيْهِ عَنَزَةٌ ـ الظُّهْرَ رَكْعَتَيْنِ، وَالْعَصْرَ رَكْعَتَيْنِ، تَمُرُّ بَيْنَ يَدَيْهِ الْمَرْأَةُ وَالْحِمَارُ‏.‏
Reference : Sahih al-Bukhari 495
In-book reference : Book 8, Hadith 142
USC-MSA web (English) reference : Vol. 1, Book 9, Hadith 474
  (deprecated numbering scheme)