Musnad Ahmad 31:11

'Abd al-Malik ibn 'Amr narrated to us, 'Abbad—meaning Ibn Rashid—narrated to us, from Dawud ibn Abi Hind, from Abu Nadrah, from Abu Sa'id, who said: "Indeed, you perform deeds that are finer in your eyes than a hair, which we used to consider during the time of the Messenger of Allah, may Allah bless him and grant him peace, among the destructive sins."