Sahih al-Bukhari, Book 72, Hadith 46 (In-Book) ⓘ
Narrated Asma': We slaughtered a horse during the lifetime of Allah's Messenger and ate it.
حَدَّثَنَا الْحُمَيْدِيُّ، حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا هِشَامٌ، عَنْ فَاطِمَةَ، عَنْ أَسْمَاءَ، قَالَتْ نَحَرْنَا فَرَسًا عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم فَأَكَلْنَاهُ.
also referenced under: Hadith 5519 (DarusSalam) & Volume 7, Book 67, Hadith 428 (USC-MSA)