أَكَلْنَا يَوْمَ خَيْبَرَ لُحُومَ الْخَيْلِ وَالْوَحْشِ وَنَهَانَا النَّبِيُّ صلى الله عليه وسلم عَنِ الْحِمَارِ .
It was narrated that Jabir said: "On the Day of Khaibar we ate the flesh of horses, and onagers, but the Prophet forbade us (from eating) donkeys."(sahih)