Hadith 100

Sahih Bukhari

Book 4: Ablutions (Wudu')

Chapter 66

(What is said) about the urine of camels, sheep and other animals and about their folds

باب أَبْوَالِ الإِبِلِ وَالدَّوَابِّ وَالْغَنَمِ وَمَرَابِضِهَا

Abu Musa offered prayer at Dar-il-Barid (post office) and there was animal dung in it though a vast strip of land was near it. Abu Musa said: Both these places are similar (for offering of the prayers). ​​
وَصَلَّى أَبُو مُوسَى فِي دَارِ الْبَرِيدِ وَالسِّرْقِينِ وَالْبَرِّيَّةُ إِلَى جَنْبِهِ فَقَالَ هَاهُنَا وَثَمَّ سَوَاءٌ.
Sahih al-Bukhari 234
حَدَّثَنَا آدَمُ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ أَخْبَرَنَا أَبُو التَّيَّاحِ، يَزِيدُ بْنُ حُمَيْدٍ عَنْ أَنَسٍ، قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم يُصَلِّي قَبْلَ أَنْ يُبْنَى الْمَسْجِدُ فِي مَرَابِضِ الْغَنَمِ‏.‏
Anas:

Prior to the construction of the mosque, the Prophet (ﷺ) offered the prayers at sheep-folds.