Sahih al-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.
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، قَالَ أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم سَابَقَ بَيْنَ الْخَيْلِ الَّتِي أُضْمِرَتْ مِنَ الْحَفْيَاءِ، وَأَمَدُهَا ثَنِيَّةُ الْوَدَاعِ، وَسَابَقَ بَيْنَ الْخَيْلِ الَّتِي لَمْ تُضْمَرْ مِنَ الثَّنِيَّةِ إِلَى مَسْجِدِ بَنِي زُرَيْقٍ، وَأَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ كَانَ فِيمَنْ سَابَقَ بِهَا‏.‏