Sahih al-Bukhari, Book 72, Hadith 37 (In-Book) ⓘ
Narrated Asma': We slaughtered a horse (by Dhabh) during the lifetime of Allah's Messenger while we were at Medina, and we ate it.
حَدَّثَنَا إِسْحَاقُ، سَمِعَ عَبْدَةَ، عَنْ هِشَامٍ، عَنْ فَاطِمَةَ، عَنْ أَسْمَاءَ، قَالَتْ ذَبَحْنَا عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم فَرَسًا وَنَحْنُ بِالْمَدِينَةِ فَأَكَلْنَاهُ.
also referenced under: Hadith 5511 (DarusSalam) & Volume 7, Book 67, Hadith 419 (USC-MSA)