Musannaf Ibn Abi Shayba 35:103

Waki’ and Abu Khalid al-Ahmar narrated to us, from Hisham ibn ‘Urwah, from Fatimah bint al-Mundhir, from Asma bint Abi Bakr, who said: We slaughtered a horse during the time of the Messenger of Allah, peace and blessings of Allah be upon him, and we ate of its meat, or we obtained of its meat.