Sahih Muslim 2808bBook 52, Hadith 44
حَدَّثَنَا عَاصِمُ بْنُ النَّضْرِ التَّيْمِيُّ، حَدَّثَنَا مُعْتَمِرٌ، قَالَ سَمِعْتُ أَبِي، حَدَّثَنَا قَتَادَةُ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّهُ حَدَّثَ عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم " إِنَّ الْكَافِرَ إِذَا عَمِلَ حَسَنَةً أُطْعِمَ بِهَا طُعْمَةً مِنَ الدُّنْيَا وَأَمَّا الْمُؤْمِنُ فَإِنَّ اللَّهَ يَدَّخِرُ لَهُ حَسَنَاتِهِ فِي الآخِرَةِ وَيُعْقِبُهُ رِزْقًا فِي الدُّنْيَا عَلَى طَاعَتِهِ " .
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.