Shabbat 147: Why We Don't Go Swimming on Shabbat
If you shake crumbs or dust, etc., off your tallit, or garment, that's akin to laundering, and incurs a korban chatat, at least for a new garment. And yet, this was not a universal approach - as some people were not concerned about it, and for them, shaking off the dust, crumbs, etc. did not matter, and therefore did not incur a korban chatat. Ulla, the key personality here, does seem to like to get involved, as he fears that those who were not particular about their garments in this way were violating Shabbat! They reassure him. Also: R. Yehudah HaNasi wore his tallit piled on his shoulders…
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