(5) باب تَحْرِيمِ أَكْلِ لَحْمِ الْحُمُرِ الإِنْسِيَّةِ
Ibn Umar reported that Allah's Messenger (way peace be upon him) forbade the eating of the flesh of domestic asses.
Reference: Sahih Muslim 561 c
In-book reference: Book 34, Hadith 37
USC-MSA web (English) reference(deprecated numbering scheme): Book 21, Hadith 4766