Sayyiduna Jarir (may Allah be pleased with him) said: I saw the Messenger of Allah (peace and blessings be upon him) twisting the forelock of a horse between his two fingers, and he said: "Goodness, spoils of war and reward are tied to the forelocks of horses until the Day of Resurrection."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2396