Sahih Bukhari
Virtues of the Prayer Hall (Sutra of the Musalla)
Volume: 001 / Book Number: 009 / Hadith Number: 474
Narrated 'Aun bin Abi Juhaifa:
I heard my father saying, "The Prophet led us, and prayed a two-Rak'at Zuhr prayer and then a two-Rak'at 'Asr prayer at Al-Batha' with an 'Anza (planted) in front of him (as a Sutra) while women and donkeys were passing in front of him (beyond that 'Anza)."