Arabic (Original)
حَدَّثَنَا هُشَيْمٌ أَخْبَرَنَا ابْنُ أَبِي لَيْلَى عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يُضَمِّرُ الْخَيْلَ.
English Translation
Hushaym told us, Ibn Abi Layla informed us, from Nafi', from Ibn Umar: that the Prophet, peace and blessings be upon him, used to train horses to make them lean and fit for racing.