Sahih al-Bukhari 4226
Book 64: Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi) · Narrated by Al-Bara Bin Azib
Arabic
حَدَّثَنِي إِبْرَاهِيمُ بْنُ مُوسَى، أَخْبَرَنَا ابْنُ أَبِي زَائِدَةَ، أَخْبَرَنَا عَاصِمٌ، عَنْ عَامِرٍ، عَنِ الْبَرَاءِ بْنِ عَازِبٍ ـ رضى الله عنهما ـ قَالَ أَمَرَنَا النَّبِيُّ صلى الله عليه وسلم فِي غَزْوَةِ خَيْبَرَ أَنْ نُلْقِيَ الْحُمُرَ الأَهْلِيَّةَ نِيئَةً وَنَضِيجَةً، ثُمَّ لَمْ يَأْمُرْنَا بِأَكْلِهِ بَعْدُ.
English translation
Narrated Al-Bara Bin Azib:During the Ghazwa of Khaibar, the Prophet (ﷺ) ordered us to throw away the meat of the donkeys whether it was still raw or cooked. He did not allow us to eat it later on
Reference: Sahih al-Bukhari 4226, Book of Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi). English translation by Dr. Muhammad Muhsin Khan.