Shabbat 50A

נוטל את הכיסוי, והן נופלות.

He lifts the cover, which he is permitted to move, and the wool fleece falls by itself. Contrary to Rava’s statement, even wool fleece in which a person insulated food may not be moved on Shabbat.

אלא אי איתמר, הכי איתמר: אמר רבא לא שנו אלא שלא יחדן להטמנה. אבל יחדן להטמנה ⁠— מטלטלין אותן.

Rather, if it was stated, it was stated as follows: Rava said: This halakha that wool fleece may not be moved on Shabbat applies only in a case where one did not designate it for insulating food. However, if he designated it for insulating food, one may move it, as in that case, it is no longer set-aside.

איתמר נמי, כי אתא רבין אמר רבי יעקב אמר רבי אסי בן שאול אמר רבי: לא שנו אלא שלא יחדן להטמנה, אבל יחדן להטמנה ⁠— מטלטלין אותן.

It was also stated that when Ravin came from Eretz Yisrael to Babylonia, he said that R' Ya’akov said that R' Asi ben Shaul said that R' Yehuda HaNasi said: This halakha that wool fleece may not be moved on Shabbat applies only in a case where one did not designate it for insulating food. However, if one designated it for insulating food, he may move it.

רבינא אומר: בשל הפתק שנו. תניא נמי הכי, גיזי צמר של הפתק אין מטלטלין אותן. ואם התקינן בעל הבית להשתמש בהן ⁠— מטלטלין אותן.

Ravina said: In fact, Rava’s statement can be understood as it was originally understood, i.e., one who insulated food in wool fleece may move it because it is considered designated for insulating food. In the Mishnah that indicates otherwise they taught about wool fleece taken from a merchant’s shelves [heftek]. That wool was certainly not designated for insulating food. It will be returned to those shelves to be sold. Therefore, it is set-aside for that purpose and may not be moved on Shabbat, even if it is used to insulate food. That was also taught in a baraita: With regard to wool fleece taken from a merchant’s shelves, one may not move it on Shabbat. And if a homeowner prepared the fleece to use it, one may move it.