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1. The Mishnah discusses blemishes in, and underneath, the nose of an animal.
2. The Mishnah and Beraisa discuss a blemish in the mouth area, including in the teeth of the animal.
3. If a Kohen makes a blemish on the ear of a sacrifice immediately after slaughtering it and before accepting the blood, it is invalid.
4. Rebbi Yehoshua: The blood of a sacrifice can still be sprinkled as long as a k'Zayis of meat or a k'Zayis of fat remains.
5. Several opinions are given to explain what law a cryptic Beraisa refers to when it states that the measure of a finger is one-fourth of a handbreadth of a normal person.
A BIT MORE
1. Each part is considered to have a blemish if the outside (as opposed to the area inside the nose) has a hole, is missing a part, or is cracked open (even if no skin is missing).
2. There are a number of opinions, and much of the dispute revolves around whether these areas are considered revealed or not revealed, as the blemish of a firstborn is only considered a blemish if it is visible (that is, not inside the animal).
3. This is derived from the verse, "And he will take from the blood of the bull," implying the bull with no blemish.
4. This proves that the law above (in #3) applies only before the Kohen receives the blood, and it does not extend to before he sprinkles the blood, because at that point it is possible that only a k'Zayis of meat of the animal is left, and there is no greater blemish that this.
5. Rabah: It refers to a discussion between Beis Hillel and Beis Shamai regarding Tzitzis. Rav Huna: It is the measurement used by the workers in the Beis ha'Mikdash. Rav Nachman: It refers to the Mishnah here which discusses a blemish in the tail.
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