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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
abudawud:2576 – Musaddad > Muʿtamir > ʿUbaydullāh > Nāfiʿ > Ibn ʿUmar

The Prophet ﷺ used to make lean by training horses which he employed in the race.  

أبو داود:٢٥٧٦ – حَدَّثَنَا مُسَدَّدٌ حَدَّثَنَا مُعْتَمِرٌ عَنْ عُبَيْدِ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ

أَنَّ نَبِيَّ اللَّهِ ﷺ كَانَ يُضَمِّرُ الْخَيْلَ يُسَابِقُ بِهَا