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'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 (ﷺ) said): For reward and booty until the Day of Judgment.
Source: sunnah.com
Other translations
Arabic
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 " .
sunnah.com