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1. Rav Yehudah says in the name of Rava that a Talmid Chacham must be proficient in Kesav (signing his name), Shechitah, and Milah.
2. If a Shochet is not proficient in Hilchos Shechitah, one is forbidden to eat from his Shechitah.
3. A Shochet must check the Simanim of the animal after Shechitah. If he fails to do so, there is a disagreement about whether the animal is regarded as a Tereifah or as a Neveilah.
4. While an animal is alive, it is b'Chezkas Isur until we are certain that it was slaughtered properly. After it is slaughtered, it is b'Chezkas Heter unless we are certain that it is a Tereifah.
5. If a wolf dragged away the innards of an animal after Shechitah and it was returned with puncture holes from the wolf's teeth, we do not suspect that it is a Tereifah and that it was perforated in that place before the wolf bit into it.
6. If one sees a bird or a rat sink its teeth into a fig, there is a concern that the fruit was previously punctured in the same spot by a snake, and it may not be eaten.
7. A Safek Tum'ah in Reshus ha'Rabim is Tahor. A Safek Tum'ah in Reshus ha'Yachid is Tamei.
8. A weasel has a Sheretz in its mouth. It walks between Kikaros of Terumah in a Reshus ha'Yachid, and there is a doubt about whether it touched the Kikaros. The Kikaros are Tahor.
9. If a utensil which holds the Mayim Chayim for a Parah Adumah was left uncovered and was subsequently found covered, it is Tamei.
10. If a utensil which holds the Mayim Chayim for a Parah Adumah was left covered and was subsequently found uncovered, if it was left on the ground where a weasel could drink from it, dew could fall into it, or a snake could drink from it, according to Raban Gamliel it is Pasul.
A BIT MORE
1. Rav Chananya bar Shelamya says in the name of Rav that he must also be proficient in making the knot for Tefilin, Tzitzis, and Birkas Chasanim.
2. Even if we saw him slaughter a few times and it was done properly, if he is not proficient in Hilchos Shechitah, one is forbidden to eat from his Shechitah.
3. If it is regarded as a Tereifah, it may not be eaten but it is not Metamei. If it is regarded as a Neveilah, it is Metamei b'Masa.
4. If there is a Safek in the Shechitah, the animal is forbidden because of its Chezkas Isur of Ever Min ha'Chai. It remains forbidden until we know for certain that it was slaughtered properly.
5. Since the animal has already been slaughtered, it is b'Chezkas Heter, and a Safek Tereifah does not affect its status.
6. When it comes to the possible danger of the venom from a snake, we are more stringent than when it comes to Isurim.
7. This is derived from the law of a Sotah, who is Tamei mi'Safek as a result of her seclusion with a man after her husband warned her not to seclude herself with him.
8. A Safek Tum'ah in Reshus ha'Yachid is Tamei only if it is a Safek Tum'ah of one who has the intellectual capacity to be asked if he is Tamei (similar to a Sotah, from which the law of Safek Tum'ah in Reshus ha'Yachid is derived).
9. This is because of the concern that a person who is Tamei covered the water and was Metamei it.
10. If a weasel drank from the water, or dew fell into it, or, according to Raban Gamliel, if a snake drank from it, the water is Pasul because it is no longer considered Mayim Chayim, since the weasel or the snake spits the water back into the utensil. It is considered Mayim Chayim only when the water was placed directly in the utensil and remained there until the ashes were placed in the water.
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