أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرٍو، عَنْ جَابِرٍ، قَالَ أَطْعَمَنَا رَسُولُ اللَّهِ صلى الله عليه وسلم لُحُومَ الْخَيْلِ وَنَهَانَا عَنْ لُحُومِ الْحُمُرِ ‏.‏

It was narrated that Jabir said: "The Messenger of Allah allowed us to eat the flesh or horses but he forbade the flesh of donkeys." Translation Not Available

Book Ref: Sunan An Nisai Book 42 Hadith 4328
Web Ref:  Sunan An Nisai Vol 5 Book 42 Hadith 4333