Overview: Beginning the Sugya of Gid HaNasheh
Chullin 90 transitions from Kisuy HaDam to the laws of Gid HaNasheh (the sciatic nerve), the prohibition that originated from Yaakov’s struggle with the angel. Much of the daf discusses how this prohibition interacts with other prohibitions, especially kodshim (sacrificial animals), and whether one issur can take effect on top of another.
Does Gid HaNasheh Apply to Kodshim?
The Mishnah teaches that the prohibition of Gid HaNasheh applies even to sacrificial animals. The Gemara asks:
Why is that not obvious?
The problem is the principle:
אין איסור חל על איסור — one prohibition generally cannot take effect on top of another prohibition.
A korban is already prohibited by virtue of its sanctity. So how can Gid HaNasheh add another prohibition?
Which Prohibition Came First?
The Gemara analyzes fetal development and concludes that the body’s limbs form before the sinews.
Therefore:
- The animal first becomes subject to the prohibition of kodshim.
- Only later does the gid develop.
This seems to mean that the prohibition of kodshim came first and should block the later prohibition of Gid HaNasheh.
Why the Gid Prohibition Still Applies
The Gemara answers that Gid HaNasheh is different because it has a broader scope.
The prohibition dates back to Yaakov Avinu before Matan Torah and therefore applies even to Bnei Noach according to Rabbi Yehudah’s approach. Since it extends beyond ordinary Torah prohibitions, it can take effect even where another prohibition already exists.
This is one of the major lomdishe discussions of the daf.
The Gid of an Olah
The Gemara discusses what should be done with the Gid HaNasheh of an olah.
- Rav Huna rules that the gid is removed and discarded onto the ash pile.
- Rav Chisda argues that it should simply be burned together with the rest of the korban.
The Gemara examines the reasoning behind both views.
The Famous Sugya of Exaggeration
One of the best-known aggadic sections of the daf concerns exaggeration in Torah language.
A Mishnah describes enormous quantities of ashes on the Mizbe’ach, including a figure of three hundred kor. Rava explains:
The Mishnah is speaking in the language of exaggeration.
The Gemara then notes that exaggeration can be found:
- In the Torah
- In the Nevi’im
- In the words of Chazal
The point is not that the statements are false, but that they use dramatic language to emphasize magnitude and importance.
Which Leg Is Forbidden?
Toward the end of the daf the Gemara begins a major discussion:
Does Gid HaNasheh apply to both legs or only one?
The Mishnah assumes that the prohibition applies to both the right and left thigh. Rabbi Yehudah disagrees and maintains that only one leg is prohibited, and the Gemara explores whether he means specifically the right leg. This debate continues into the next daf.
Big Idea of the Daf
The central theme of Chullin 90 is:
Some prohibitions are powerful enough to take effect even where another prohibition already exists, and understanding their scope requires tracing their origin and purpose.
Final Summary
Chullin 90 opens the sugya of Gid HaNasheh. The Gemara analyzes how the prohibition applies to sacrificial animals despite the rule of ein issur chal al issur, discusses whether the gid of an olah is burned or removed, introduces the famous principle that Chazal sometimes speak in deliberate exaggeration, and begins the debate over whether Gid HaNasheh applies to one leg or both.