Sahih Muslim Book - 34, Hadith - 5010

وحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا عَلِيُّ بْنُ مُسْهِرٍ ، عَنِ الشَّيْبَانِيِّ ، قَالَ: سَأَلْتُ عَبْدَ اللهِ بْنَ أَبِي أَوْفَى عَنْ لُحُومِ الْحُمُرِ الأَهْلِيَّةِ ، فَقَالَ: أَصَابَتْنَا مَجَاعَةٌ يَوْمَ خَيْبَرَ وَنَحْنُ مَعَ رَسُولِ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، وَقَدْ أَصَبْنَا لِلْقَوْمِ حُمُرًا خَارِجَةً مِنَ الْمَدِينَةِ ، فَنَحَرْنَاهَا ، فَإِنَّ قُدُورَنَا لَتَغْلِي ، إِذْ نَادَى مُنَادِي رَسُولِ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنِ اكْفَؤُوا الْقُدُورَ ، وَلاَ تَطْعَمُوا مِنْ لُحُومِ الْحُمُرِ شَيْئًا ، فَقُلْتُ: حَرَّمَهَا تَحْرِيمَ مَاذَا ؟ قَالَ: تَحَدَّثْنَا بَيْنَنَا ، فَقُلْنَا : حَرَّمَهَا الْبَتَّةَ ، وَحَرَّمَهَا مِنْ أَجْلِ أَنَّهَا لَمْ تُخَمَّسْ.

It was narrated that Ash-Shaibani said: "I asked 'Abdullah bin Abi Awfa about the meat of domesticated donkeys. He said: 'We were stricken with hunger on the Day of Khaibar, when we were with the Messenger of Allah (s.a.w), and the people had captured some donkeys outside Al-Madinah. So we slaughtered them, and the cooking pots were boiling, when the caller of the Messenger of Allah (s.a.w) cried out that the cooking pots should be overturned and nothing of the donkey meat should be eaten.' I said: "What kind of prohibition was it?"' He said: 'We talked about that amongst ourselves, did he (s.a.w) prohibit it forever or did he prohibit it because it had not been distributed as it should have been (i.e., with the Khumus being taken out before the booty was divided)?"'