Sahih Muslim Book - 34, Hadith - 5020

وحَدَّثَنَا ابْنُ أَبِي عُمَرَ ، حَدَّثَنَا سُفْيَانُ ، عَنْ أَيُّوبَ ، عَنْ مُحَمَّدٍ ، عَنْ أَنَسٍ ، قَالَ : لَمَّا فَتَحَ رَسُولُ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ خَيْبَرَ ، أَصَبْنَا حُمُرًا خَارِجًا مِنَ الْقَرْيَةِ ، فَطَبَخْنَا مِنْهَا ، فَنَادَى مُنَادِي رَسُولِ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : أَلاَ إِنَّ اللَّهَ وَرَسُولَهُ يَنْهَيَانِكُمْ عَنْهَا ، فَإِنَّهَا رِجْسٌ مِنْ عَمَلِ الشَّيْطَانِ ، فَأُكْفِئَتِ الْقُدُورُ بِمَا فِيهَا ، وَإِنَّهَا لَتَفُورُ بِمَا فِيهَا.

It was narrated that Anas said: "When the Messenger of Allah (s.a.w) conquered Khaibar, we captured some donkeys outside the town, and we cooked some of them. Then the caller of the Messenger of Allah (s.a.w) cried out (saying); 'Allah and His Messenger have forbidden it to you, for it is an abomination of the Shaitan's handiwork.' So the pots and their contents were overturned, and they were brimming with their contents.''