Musnad Ahmad 30:1819

Qutaybah ibn Sa'id narrated to us, he said: Ibn Lahi'ah narrated to us, from Musa ibn Wardan, from Abu Hurairah, that the Messenger of Allah, peace and blessings of Allah be upon him, said: "Indeed, the believer wears out his devils, just as one of you wears out his camel during a journey."