Bukhari 420

Narrated `Abdullah bin `Umar:Allah's Messenger (ﷺ) ordered for a horse race; the trained horses were to run from a place called Al-Hafya' to Thaniyat Al-Wada` and the horses which were not trained were to run from Al-Thaniya to the Masjid (mosque of) Bani Zuraiq. The sub narrator added: Ibn `Umar was one of those who took part in the race