The Book Giving Description of the Day of Judgement, Paradise and Hell (Kitab Sifat Al-Qiyamah wa'l Janna wa'n-Nar)
Muslim :: Book 39 : Hadith 6740
Anas b. Malik reported that Allah's Messenger (may peace be upon him) thus told him: When a non-believer does good he is made to taste Its reward in this world. And so far as the believer is concerned, Allah stores (the reward) of his virtues for the Hereafter and provides him sustenance in accordance with his obedience to Him.