Commentary for Sukkah 92:7
א"ל סוכה דחזיא לבין השמשות דאי איתרמי ליה סעודתא בעי מיתב בגווה ומיכל (בה) בגווה אתקצאי לבין השמשות ומיגו דאתקצאי לבין השמשות אתקצאי לכולי יומא דשמיני אתרוג דלא חזי לבין השמשות לא אתקצאי לבין השמשות ולא אתקצאי לכולי יומא דשמיני
He said to him: The Sukkah is fit to be used at twilight [after the seventh day], for if he by chance has a meal at that time he would have to sit in it and eat therein, therefore it is set aside for its ritual purpose during twilight, and since it is set aside during twilight, it is also set aside for the whole of the eighth day. The etrog, however, which is not suitable during twilight, is not set aside for its ritual purpose during twilight, hence it is not set aside for the whole day.
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