The Book of Hunting, Slaughter, and what may be Eaten
وَحَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا عُبَيْدُ اللَّهِ، حَدَّثَنِي نَافِعٌ، وَسَالِمٌ عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنْ أَكْلِ لُحُومِ الْحُمُرِ الأَهْلِيَّةِ .Ibn Umar reported that Allah's Messenger (way peace be upon him) forbade the eating of the flesh of domestic asses
From Sahih Muslim, whose reports the scholars accept as authentic.