The Mishnah Berurah writes that it is permissible to have a meal in which milchig food is eaten first and fleishig food is eaten afterwards. However, it is necessary to 'wipe and rinse' one's mouth [by eating and drinking something pareve] and to make sure one's hands are free of any milchig residue between the milchig and fleishig foods. This is the rule for ordinary milchigs, but if one eats "hard cheese" it is necessary to bentch and wait six hours. Rav Shmuel Wosner cites a minhag that requires waiting at least half an hour after eating any milchigs before one can eat fleishigs. The Mishnah Berurah points out that it is forbidden to use the same loaf of bread for both milchigs and fleishigs.
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Hilchos Tzitzis 14 (page 51)
K'suscha-Owning the Tzitzis Garment
Reciting a Beracha on a Talis Barrowed for the Mitzva
Reciting a Beracha on a Talis Worn for an Aliya or Birkas Kohanim
Ksuscha - owning the tzitzis garment
The Torah uses the word ksuscha - your garment - when discussing the mitzva of tzitzis. Chazal understood the emphasis on your to mean that only a garment that you own is required to have tzitzis, not one that you borrow from someone else. Both borrowed and rented garments are exempt from tzitzis. A borrowed or rented garment in your possession for over thirty days becomes obligated in tzitzismid'rabonon and requires a beracha because it seems as though it is yours. It is permissible to insert tzitzis into a borrowed or rented garment in your possession for less than thirty days and, according to some, a beracha can be recited.
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Reciting a beracha on a talis borrowed for the mitzva
According to most poskim, someone who borrows a talis for davening or for an extended period is obligated to recite a beracha. It is assumed that the lender actually gifted the talis for the purpose of the mitzva. It is considered a matana al menas l'hachzir and therefore becomes your garment. If the garment is not returned in the condition it was received, the gift is retroactively voided. L'chatchila, when borrowing a talis one should clarify that the intention is for a matana al menas l'hachzir.
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Reciting a beracha on a talis worn for an aliya or for birkas kohanim
The poskim discuss whether someone who borrows a talis for an aliya, or as a kohen for birkas kohanim, must recite a beracha. In that situation, it is recommended that a person intend only to borrow the talis and not receive it a as matana al menas l'hachzir, so as to be exempt according to all opinions. According to some poskim, a beracha is recited when using a public talis (e.g. shul talis) for an aliya, etc. Other poskim hold that the beracha is questionable in this case, and it is preferable to borrow a private talis rather than run into questions.
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B'dieved,tzitzis tied by a woman or by a minor who is under constant supervision from beginning to end are kosher. Tzitzis tied by a goy are invalid.
According to the Rambam, it is not necessary to tie the tzitzis knots l'shma, but Rashi and many other Rishonim require them to be tied l'shma.
For a beracha to be recited, the strings must have been inserted and the initial tying done l'shma. It is questionable if a beracha can be recited if the tzitzis were not inserted l'shma but were tied l'shma.
Using another's talis without permission
Using another's sefarim or tefillin without permission