Sahih Muslim Book 39, Hadith Number 6739.
Chapter : Dipping of the most affluent people of the world in the hell-fire and dipping of the most (worldly) miserable in Paradise.
Anas b. Malik reported that Allah’s Messenger (may peace be upon him) said: Verily, Allah does nut treat a believer unjustly in regard to his virtues. He would confer upon him (His blessing) in this world and would give him reward in the Hereafter. And as regards a non-believer, he would be made to taste the reward (of virtue in this world) what as has done for himself so much that when it would be the Hereafter, he would find no virtue for which he should be rewarded.