Rashi, Deuteronomy 16:13
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רש"י דברים פרק טז פסוק יג
:באספך - בזמן האסיף שאתה מכניס לבית פירות הקיץ. דבר אחר באספך מגרנך ומיקבך, למד שמסככין את הסוכה בפסולת גורן ויקב
When you gather in [the produce]: [i.e.,] at the time of the ingathering, when you bring the summer fruits into the house. Another explanation:“when you gather in [the produce] from your threshing floor and your vat” teaches that we should cover the sukkah [only] with the waste products that come from the threshing floor and the vat. [Judaica Press translation]
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Suggested Discussion Questions:

What is the connection between this source and the principle of Bal Tashchit (Do not waste/Do not destroy)?

Can you think of ways to reuse items that would otherwise be thrown away in your Sukkah?

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Time Period: Medieval (Geonim through the 16th Century)