Lawful and Unlawful Food - Section 1 Mishkat al-Masabih 4107
Arabic hadith text
وَعَنْ جَابِرٍ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى يَوْمَ خَيْبَرَ عَنْ لُحُومِ الْحُمُرِ الْأَهْلِيَّةِ وَأَذِنَ فِي لُحُومِ الْخَيْلِ
Translation
Jabir said that on the day of Khaibar God’s messenger forbade the flesh of domestic asses, but permitted horseflesh. (Bukhari and Muslim.)