Mesorat%20hashas for Sukkah 108:6
כי מקלעינן יום טוב ראשון בערב שבת מדחי דחינן ליה מאי טעמא כיון דאיקלע יו"ט הראשון של חג להיות בע"ש יוה"כ אימת הוי בחד בשבת הלכך דחינן ליה
When the first day of the Festival [of Sukkot] would coincide with the eve of Shabbat, they postpone it. What is the reason? Because if the first day of the Festival of Sukkot were to fall on the eve of Shabbat, when would Yom Kippur be? On the [previous] Sunday. Therefore it is postponed.
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