Musnad Ahmad 30:364

Yazid narrated to us, Muhammad ibn ‘Amr informed us, from Abu al-Hakam, the freed slave of the Laythis, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "There is no prize for a race except in a hoof, or a hoofed animal, or an arrow."