Maliks Muwatta Book 21, Hadith Number 4.

Yahya related to me from Abdullah ibn Abd ar-Rahman ibn Mamar al-Ansari that Ata ibn Yasar said that the Messenger of Allah, may Allah bless him and grant him peace, said, “Shall I tell you who has the best degree among people? A man who takes the rein of his horse to do jihad in the way of Allah. Shall I tell you who has the best degree among people after him? A man who lives alone with a few sheep, performs the prayer, pays the zakat, and worships Allah without associating anything with him.”