وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا ابْنُ فُضَيْلٍ، وَابْنُ، إِدْرِيسَ عَنْ حُصَيْنٍ، عَنِ الشَّعْبِيِّ، عَنْ عُرْوَةَ الْبَارِقِيِّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ الْخَيْرُ مَعْقُوصٌ بِنَوَاصِي الْخَيْلِ ‏"‏ ‏.‏ قَالَ فَقِيلَ لَهُ يَا رَسُولَ اللَّهِ بِمَ ذَاكَ قَالَ ‏"‏ الأَجْرُ وَالْمَغْنَمُ إِلَى يَوْمِ الْقِيَامَةِ ‏"‏ ‏.‏

'Urwat al-Bariqi reported Allah's Messenger (PBUH) having said this: Good is tied to the forelock of the horses. It Was said to him: Messenger of Allah, why is it so? He (the Prophet said): For reward and booty until the Day of Judgment. Translation Not Available

Book Ref: Sahih Muslim Book 33 Hadith 4617
Web Ref:  Sahih Muslim Book 20 Hadith 1873 b