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# Technically, anything that is detached from the ground and sharp can be used for kosher slaughter, as long as it's free of imperfections. A reed membrane would be good if it doesn't have any splinters that would come out. Practically, however, this is exclusively done with a knife.<ref>Simla Chadasha 6:1</ref> | # Technically, anything that is detached from the ground and sharp can be used for kosher slaughter, as long as it's free of imperfections. A reed membrane would be good if it doesn't have any splinters that would come out. Practically, however, this is exclusively done with a knife.<ref>Simla Chadasha 6:1</ref> | ||
# One shouldn't use a scythe or even a double edged knife if one side of it is a scythe. Bediavad if he did it and knows he used the kosher side, it's ok, and if he smoothened out the scythe side then he can use it lechatechilah.<ref>Simla Chadasha 6:2</ref> | # One shouldn't use a scythe or even a double edged knife if one side of it is a scythe. Bediavad if he did it and knows he used the kosher side, it's ok, and if he smoothened out the scythe side then he can use it lechatechilah.<ref>Simla Chadasha 6:2</ref> | ||
=== | === Invalidating Factors=== | ||
# | # A knife cannot have any nicks in it or be used previously with non-Kosher food or for idolatry. It must not be glowing hot or attached to something else. ''See [[Knives That Cannot Be Used for Shechitah]] for details.'' | ||
''See [[Knives That Cannot Be Used for Shechitah]] for details. | |||
==Crafting a Shechitah Knife== | ==Crafting a Shechitah Knife== | ||
Modern day shechitah knives are commonly rectangularly shaped to facilitate shechitah without issues of chaladah and derasa and made with easy to sharpen steel that maintains its edge to minimize pegimot. | Modern day shechitah knives are commonly rectangularly shaped to facilitate shechitah without issues of chaladah and derasa and made with easy to sharpen steel that maintains its edge to minimize pegimot. | ||
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==Checking a Shechitah Knife== | ==Checking a Shechitah Knife== | ||
===The Need to Check=== | |||
# Shechting with a knife that has a nick renders the animal a Nevelah Min HaTorah, as it tears the simanim. Therefore, the Shochet must check his knife before slaughter. A knife cannot be presumed to be free of nicks.<ref>Simla Chadasha 18:1</ref> | |||
# One cannot shecht first and check later for three reasons: he may ultimately forget to check, the recitation of the beracha will be potentially in vain, and one may be mutilating an animal for no reason, which is prohibited.<ref>Simla Chadasha 18:1</ref> | |||
# Taking extra care to guard the knife from nicks is not satisfactory justification to assume it is nick free and not check prior to the next shechitah, due to the fragility of the blade edge. One may only be lenient in extreme circumstances.<ref>Simla Chadasha 18:1</ref> | |||
# Nevertheless, if one did shecht with a random knife and, upon checking afterwards, it was found to be fine, the meat is kosher.<ref>Simla Chadasha 18:1</ref> | |||
==Guides== | ==Guides== |