Musnad Ahmad 30:2595

Waki’ narrated to us, he said: Usamah bin Zaid narrated to us, from Bajalah bin ‘Abdullah al-Juhani, from Abu Hurairah, he said: The Messenger of Allah (ﷺ) said: "A time will surely come upon the people in which the best of people in status will be a man who takes hold of the reins of his horse in the way of Allah; whenever he hears a clamor, he mounts its back, then seeks death in its places. And a man in one of these mountain passes, who establishes prayer, gives zakat, and leaves the people alone, except for good."