Shabbat 133B

גמ׳ מכדי קתני כולהו, ״כל צורכי מילה״ לאתויי מאי?

Talmud: The Talmud asks: Since the Mishnah is teaching all of them, i.e., enumerated all the requirements of circumcision, when the Mishnah added: One performs all the requirements of circumcision even on Shabbat, what did it come to include?

לאתויי הא דתנו רבנן: המל, כל זמן שהוא עוסק במילה ⁠— חוזר בין על הציצין המעכבין את המילה בין על הציצין שאין מעכבין את המילה. פירש, על ציצין המעכבין את המילה ⁠— חוזר, על ציצין שאין מעכבין את המילה ⁠— אינו חוזר.

The Talmud answers: It comes to include that which A baraita states: One who circumcises on Shabbat, as long as he is engaged in the circumcision, he may return and remove shreds of skin that were not cut properly. This is the ruling both for shreds of skin and flesh that invalidate the circumcision if they are not cut, i.e., the child is not considered circumcised if they remain, and for shreds that do not invalidate the circumcision if they are not cut. But if the circumcisor has withdrawn from engaging in the mitzva of circumcision, he may return for shreds that invalidate the circumcision if they were not cut, as the mitzva has not yet been properly performed, but he may not return for shreds that do not invalidate the circumcision if they are not cut. Consequently, when the Mishnah refers to all the requirements of circumcision, it means that as long as one is still involved in the act of circumcision, one may go back and remove even pieces of skin that do not invalidate the circumcision.

מאן תנא פירש אינו חוזר? אמר רבה בר בר חנה אמר רבי יוחנן: רבי ישמעאל בנו של רבי יוחנן בן ברוקה היא. דתניא: ארבעה עשר שחל להיות בשבת ⁠— מפשיט אדם הפסח עד החזה, דברי רבי ישמעאל בנו של רבי יוחנן בן ברוקה. וחכמים אומרים: מפשיטין את כולו.

With regard to this law, the Talmud asks: Who is the tanna who holds that if one has already withdrawn from a mitzva he may not return to engage in its performance? Which tanna asserts that as long as a person is involved in a mitzva whose performance overrides Shabbat, he may complete it; however, if he is no longer involved in the mitzva, he may not exceed the minimum requirements if doing so would desecrate Shabbat? Rabba bar bar Ḥana said that R' Yoḥanan said: It is R' Yishmael, son of R' Yoḥanan ben Beroka, as it was taught in a baraita: In a case of the 14th of Nisan, the day the Paschal lamb is sacrificed, that occurs on Shabbat, one flays the Paschal lamb until he exposes the breast, in order to remove the portions that are offered on the altar, but one does not flay anymore, as it is not necessary for the mitzva of the day; this is the statement of R' Yishmael, son of R' Yoḥanan ben Beroka. And the Rabbis say: One may even flay the entire hide.