Lady Asma bint Abi Bakr (may Allah be pleased with them both) said that we ate horse meat in Madinah during the blessed era of the Messenger of Allah (peace and blessings be upon him).
Hadith Referenceسنن دارمي / من كتاب الاضاحي / 2031
Sayyiduna Jabir bin Abdullah (may Allah be pleased with both of them) said: The Messenger of Allah (peace and blessings be upon him) on the day of Khaybar forbade the meat of domesticated donkeys, and permitted (the eating of) horse meat.
Hadith Referenceسنن دارمي / من كتاب الاضاحي / 2032