Sahih al-Bukhari 2869
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.").
حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، حَدَّثَنَا اللَّيْثُ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه أَنَّ النَّبِيَّ صلى الله عليه وسلم سَابَقَ بَيْنَ الْخَيْلِ الَّتِي لَمْ تُضَمَّرْ، وَكَانَ أَمَدُهَا مِنَ الثَّنِيَّةِ إِلَى مَسْجِدِ بَنِي زُرَيْقٍ‏.‏ وَأَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ كَانَ سَابَقَ بِهَا‏.‏   
قَالَ أَبُو عَبْد اللَّهِ أَمَدًا غَايَةً  فَطَالَ عَلَيْهِمْ الْأَمَدُ