Sahih Bukhari, Chapter: Jihaad (Fighting for the cause of Allah)

The Prophet (SAW) arranged for a horse race amongst the horses that had been made lean to take place between Al-Hafya and Thaniyat Al-Wada (i.e. names of two places) and the horses which had not been made lean from Ath-Thaniyat to the mosque of Bani Zuraiq. I was also amongst those who took part in that horse race. Sufyan, a sub-narrator, said, "The distance between Al-Hafya and Thaniya Al-Wada is five or six miles; and between Thaniyat and the mosque of Bani Zuraiq is one mile."