حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ الْخَيْلُ فِي نَوَاصِيهَا الْخَيْرُ إِلَى يَوْمِ الْقِيَامَةِ ‏"‏ ‏.‏

'Urwat al-Bariqi reported Allah's Messenger (ﷺ) 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.