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משל הקב"ה - אוכל פירות בעוה"ז והקרן קיימת לו לעוה"ב: From the Holy One, Blessed be He. Rashi says that Hashem will pay him back the additional money he spent in his lifetime. Tosafot is uncomfortable with this explanation because ultimately it is better to be rewarded in the next world where reward is eternal than in this passing existence. The Mishna at the beginning of Masechet Pai’oh says that there are certain mitzvos for which the principal reward is in the world to come and only the dividends are paid in this world. Tosafot holds that the same applies here.
He eats the dividends1 פירות- literally fruits. in this world and the principal remains for him in the world to come.