The Shulchan Aruch holds that one may borrow and make a brachah on someone else's Tallis without their permission provided that you put it back the way you found it (OC 14:4).

In the previous halachah, though (14:3), he held that if you borrow a Tallis that is missing tzitzis you only have to string it after thirty days, and even then only because of mar'is ayin, as the passuk says "your garment" and not that of someone else. Therefore only talleisim that belong to you are obligated in tzitzis. Why don't we make the same derashah in 14:4 to exclude a borrowed Tallis from the mitzvah of tzitzis?

  • Who says we don't make that Drasha there too? – Double AA Jan 23 '17 at 22:19
  • @DoubleAA It's permissible. Necessarily we don't make the derashah that says it's not permissible. – DonielF Jan 23 '17 at 22:22
  • Wait what drasha said something is not permissible? I see a drasha that says something is not obligatory. – Double AA Jan 23 '17 at 22:22
  • @DoubleAA The passuk says that tzitzis are put on your garment and not someone else's. If you put it on someone else's it's just strings, not tzitzis. So why is it called tzitzis in halachah dalet to not only permit borrowing the Tallis without permission but even to make a brachah on it? – DonielF Jan 23 '17 at 22:34

After doing some digging I found the Rosh in Chullin 8:26 is the source for the Shulchan Aruch, who says that if one borrows a Tallis for the sake of the Mitzvah it's like a Matanah al Menas LeHachazir and therefore does fulfill the criterion of Kesusecha. I will note that he does say that really he's patur on a borrowed Tallis, which ultimately is the Gemara on 110a that he's commenting on.

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  • Can you clarify which part of the ShA exactly this is the source for? Surely not every borrowed Tallis is a MAMLH and yet they all seem to get blessings (at least after 30 days if not before). – Double AA Jan 24 '17 at 4:30
  • @DoubleAA Both 14:3 and 14:4 come from this Rosh. I will emphasize the word "like". We give it the halachos of one even if it's not specified explicitly. – DonielF Jan 24 '17 at 4:36

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