Commentary for Sukkah 18:7

היכי דמי אילימא בשלא חבטן הא קא מצטרף סכך פסול עם סכך כשר אלא לאו כשחבטן ושמע מינה דלא גזרינן מהו דתימא הני מילי בדיעבד אבל לכתחילה לא קמ"ל:

Now to what case does this refer? Now to what case does this refer? If I say where he did not interweave them, then behold he joins the invalid covering to the valid one? Rather it refers to a case where one did interweave them; and we learn from here that we don't decree against this?What might you have thought? That [this is permissible] only ex post facto but not ab initio, hence we were informed

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