I saw that the Messenger of Allah ﷺ was twisting the forelock of a horse with his fingers and he was saying: (A great) benefit. i. e. reward (for rearing them for Jihad) and spoils of war, has been tied to the forelocks of horses until the Day of Judgment. (Using translation from Muslim 1872a)
رَأَيْتُ رَسُولَ اللهِ ﷺ يَفْتِلُ نَاصِيَةَ فَرَسٍ بَيْنَ إِصْبُعَيْهِ وَيَقُولُ «الْخَيْلُ مَعْقُودٌ فِي نَوَاصِيهَا الْخَيْرُ إِلَى يَوْمِ الْقِيَامَةِ الْأَجْرُ وَالْغَنِيمَةُ»