Sunan an-Nasa'i, Volume 5, Book 42, Hadith 4335 (DarusSalam) ⓘ
It was narrated that Jabir said: "We used to eat horse meat during the time of the Messenger of Allah."
أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ، - وَهُوَ ابْنُ عَمْرٍو - قَالَ حَدَّثَنَا عَبْدُ الْكَرِيمِ، عَنْ عَطَاءٍ، عَنْ جَابِرٍ، قَالَ كُنَّا نَأْكُلُ لُحُومَ الْخَيْلِ عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم .
also referenced under: Hadith 4330 (Reference) & Book 42, Hadith 68 (In-Book)