Reference for Pesachim 63:4
אמר רב יוסף תא שמע אכל גרוגרות ושילם לו תמרים תבא עליו ברכה אי אמרת בשלמא לפי מדה משלם אמטו להכי תבא עליו ברכה דאכיל גריוא דגרוגרות דשויא זוזא וקא יהיב גריוא דתמרים דשויא ארבעה אלא אי אמרת לפי דמים משלם אמאי תבא עליו ברכה בזוזא אכל בזוזא קא משלם
Must he repay according to quantity, for he [the priest] can say, He ate a griwa,<span class="x" onmousemove="('comment',' A dry measure equal to one se'ah.');"><sup>7</sup></span> he must repay a griwa; or perhaps he repays according to the value: he ate [the worth of] a zuz, he repays [the worth of] a zuz? - Said R'Joseph, Come and hear: If he ate figs [of terumah] and repaid him dates, blessings be upon him! It is well if you say that he must repay according to quantity: therefore 'blessings be upon him,' because he ate a griwa of dried figs, which is worth a zuz, and he returns [him] a griwa of dates, which is worth four. But if you say that he pays according to its value, why should 'blessings be upon him': he ate for a zuz and he returns [as much as] for a zuz? - Said Abaye, Indeed he pays according to value, yet why should 'blessings come upon him'?