(26) باب 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.
Reference: Sahih Muslim 1873 b
In-book reference: Book 33, Hadith 146
USC-MSA web (English) reference(deprecated numbering scheme): Book 20, Hadith 4617