Sahih al-Bukhari 2870
Narrated Abu 'Is-haq from Musa bin `Uqba from Mafia from Ibn `Umar who said:
"Allah's Messenger (ﷺ) arranged a horse race amongst the horses that had been made lean, letting them start 
from Al-Hafya' and their limit (distance of running) was up to Thaniyat-al-Wada`. I asked Musa, 
'What was the distance between the two places?' Musa replied, 'Six or seven miles. He arranged a race 
of the horses which had not been made lean sending them from Thaniyat-al-Wada`, and their limit 
was up to the mosque of Bani Zuraiq.' I asked, 'What was the distance between those two places?' He 
replied 'One mile or so.' Ibn `Umar was amongst those who participated in that horse race."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ، حَدَّثَنَا مُعَاوِيَةُ، حَدَّثَنَا أَبُو إِسْحَاقَ، عَنْ مُوسَى بْنِ عُقْبَةَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ سَابَقَ رَسُولُ اللَّهِ صلى الله عليه وسلم بَيْنَ الْخَيْلِ الَّتِي قَدْ أُضْمِرَتْ فَأَرْسَلَهَا مِنَ الْحَفْيَاءِ، وَكَانَ أَمَدُهَا ثَنِيَّةَ الْوَدَاعِ‏.‏ فَقُلْتُ لِمُوسَى فَكَمْ كَانَ بَيْنَ ذَلِكَ قَالَ سِتَّةُ أَمْيَالٍ أَوْ سَبْعَةٌ‏.‏ وَسَابَقَ بَيْنَ الْخَيْلِ الَّتِي لَمْ تُضَمَّرْ، فَأَرْسَلَهَا مِنْ ثَنِيَّةِ الْوَدَاعِ، وَكَانَ أَمَدُهَا مَسْجِدَ بَنِي زُرَيْقٍ، قُلْتُ فَكَمْ بَيْنَ ذَلِكَ قَالَ مِيلٌ أَوْ نَحْوُهُ‏.‏ وَكَانَ ابْنُ عُمَرَ مِمَّنْ سَابَقَ فِيهَا‏.‏