Overview
Chullin 97 is one of the foundational dapim for the laws of ta’am (absorbed taste) and bitul b’shishim (nullification in sixty). The Gemara analyzes how forbidden foods affect permitted foods through flavor transfer and develops practical rules for determining whether a mixture remains permitted.
Does Flavor Spread?
The daf opens with a discussion comparing Gid HaNasheh and chelev (forbidden fat).
The Gemara explains:
Chelev is different because it permeates.
When fat is heated, its taste spreads throughout nearby meat. Therefore, roasting an animal together with forbidden fat may affect much more than the immediate area.
By contrast, the gid itself is less likely to spread flavor throughout the entire piece under certain conditions.
Rabbi Yochanan’s Case
The Gemara cites an incident where a kid was roasted together with forbidden fat.
Rabbi Yochanan ruled:
Peel away the affected area and eat the rest.
The Gemara reconciles this with the principle that fat spreads by explaining that the particular animal was unusually lean, so there was not enough fat to permeate the meat significantly.
Salting Is Like Cooking
The Gemara discusses thighs that were salted with the Gid HaNasheh still inside.
This leads to Shmuel’s famous principle:
מליח הרי הוא כרותח
“Salted food is considered like hot food.”
And likewise:
כבוש הרי הוא כמבושל
“Pickled food is considered like cooked food.”
These principles become fundamental throughout the laws of kashrut.
How Do We Determine Whether Taste Is Present?
A major discussion concerns mixtures of permitted and forbidden foods.
Rava explains that there are several methods:
- Sometimes the mixture can be evaluated by taste.
- Sometimes one relies on an expert taster.
- Sometimes one relies on quantitative measurements.
The key issue is whether the forbidden taste can still be detected.
The Origin of Bitul B’Shishim
One of the most influential rulings of the daf is:
When taste cannot be independently evaluated, the Sages use a ratio of sixty-to-one.
If there is sixty times as much permitted food as prohibited food, the forbidden taste is considered nullified.
This becomes the classic halachic standard used throughout kashrut.
Min B’Mino and Min She’eino Mino
The Gemara distinguishes between:
Min B’Mino
A food mixed with the same type of food.
Since the tastes are identical, taste-testing cannot easily determine whether forbidden flavor remains. Therefore other methods, including the sixty-to-one rule, are needed.
Min She’eino Mino
A food mixed with a different type of food.
Here taste can often determine whether the prohibition has affected the mixture.
Big Idea of the Daf
The central theme of Chullin 97 is:
In kashrut, the legal status of food is often determined not merely by the presence of forbidden material, but by whether its taste remains significant.
Final Summary
Chullin 97 establishes many of the core principles of ta’am and bitul. The Gemara explains why forbidden fat spreads flavor, introduces the rules that salting and pickling resemble cooking, discusses when tasting may be relied upon, and develops the famous standard of bitul b’shishim. These discussions form much of the foundation of the practical laws of mixtures in kashrut.