Musnad Ahmad 943:10

Bahz narrated to us, Muhammad ibn Talhah ibn Musarrif narrated to us, from Abdullah ibn Sharik al-Amiri, from Abd al-Rahman ibn Adi al-Kindi, from al-Ash'ath ibn Qays, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, the most grateful of people to Allah is the most grateful of them to the people."