(57) باب إِضْمَارِ الْخَيْلِ لِلسَّبْقِ
Narrated `Abdullah:
The Prophet (ﷺ) arranged for a horse race of the horses which had not been made lean; the area of the race was from Ath-Thaniya to the mosque of Bani Zuraiq. (The sub-narrator said, "`Abdullah bin `Umar was amongst those who participated in that horse race.").
Reference: Sahih al-Bukhari 2869
In-book reference: Book 56, Hadith 85
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 52, Hadith 121