Musnad Ahmad 30:3648

'Abd al-Malik ibn 'Amr and Surayj narrated to us, they said: Fulayh narrated to us, from 'Abd Allah—meaning Ibn Ma'mar, who is Abu Tuwalah—from Sa'id ibn Yasar, from Abu Hurayrah, that the Prophet, peace and blessings of Allah be upon him, said: "Shall I not inform you of the person with the best status among the people? A man holding the rein of his horse in the way of Allah. Shall I not inform you of the person with the best status among the people after him? A man secluded with his sheep—or a small flock—who establishes the prayer, gives the zakat, and worships Allah, not associating anything with Him."