Reference for Sukkah 71:9

א"ל אביי דלמא לא היא עד כאן לא קאמר ר"ע הכא דבעינן הדר וליכא אבל התם כרבנן סבירא ליה

Abaye said to him: But perhaps it is not so. R. Akiva may have stated his view only here, since the etrog must be "goodly," while [an unripe etrog] is not, but there he may agree with the sages

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