Shabbat 147A

המנער טליתו בשבת ⁠— חייב חטאת. ולא אמרן אלא בחדתי, אבל בעתיקי ⁠— לית לן בה. ולא אמרן אלא באוכמי, אבל בחיורי וסומקי ⁠— לית לן בה, והוא דקפיד עלייהו.

One who shakes his cloak on Shabbat to remove dust that collected on it is liable to bring a sin-offering for violating the prohibition of laundering. The Talmud qualifies this ruling: We only stated this halakha with regard to new garments, but with regard to old garments, we have no problem with this behavior. And we only stated this with regard to black garments, but with regard to white or red garments, we have no problem, as shaking off the dust would not be prohibited. And this prohibition applies only when one is particular about keeping them clean, but if one does not insist on wearing clean garments, we have no problem with it, i.e., it is not prohibited to shake off the dust.

עולא איקלע לפומבדיתא, חזא רבנן דקא מנפצי גלימייהו, אמר: קמחללין רבנן שבתא. אמר להו רב יהודה: נפוצו ליה באפיה, אנן לא קפדינן מידי.

The Talmud relates that Ulla happened to come to Pumbedita, and while there he saw rabbis shaking their cloaks to remove dust. He said: The Rabbis are desecrating Shabbat. Rav Yehuda said to the Rabbis whom Ulla criticized: You may continue to shake your cloaks in his presence. We are not at all particular about this, and it is therefore permitted for us to shake the dust from our cloaks.

אביי הוה קאי קמיה דרב יוסף. אמר ליה: הב לי כומתאי. [חזא דאיכא] טלא עליה, הוה קמחסם למיתבה ליה. אמר ליה: נפוץ שדי, אנן לא קפדינן מידי.

The Talmud also relates that Abaye was standing before Rav Yosef. Rav Yosef said to him: Give me my hat. Abaye saw that there was dew on it, and he hesitated to give it to him, because he feared violating a prohibition by shaking off the dew. Rav Yosef said to him: Shake off the dew and throw me the hat; we are not at all particular about the cleanliness of the hat, and it is therefore permitted to shake off the dew.