ד
נָעַץ סַכִּין בַּכֹּתֶל, וְהֶעֱבִיר הַצַּוָּאר עַד שֶׁנִּשְׁחַט, שְׁחִיטָתוֹ כְּשֵׁרָה, וְהוּא שֶׁיִּהְיֶה צַוַּאר הַבְּהֵמָה לְמַטָּה וְהַסַכִּין לְמַעְלָה, שֶׁאִם הָיָה צַוַּאר בְּהֵמָה לְמַעְלָה מֵהַסַכִּין שֶׁמֶּא תֵּרֵד הַבְּהֵמָה בְּכֹבֶד גּוּפָהּ וְתַחְתֹּךְ בְּלֹא הוֹלָכָה וַהֲבָאָה, וְאֵין זוֹ שְׁחִיטָה, וַאֲפִלּוּ אָמַר: בָּרִי לִי שֶׁלֹּא דָּרַסְתִּי, שְׁחִיטָתוֹ פְּסוּלָה, לְפִיכָךְ, אִם הָיָה עוֹף, בֵּין שֶׁהָיָה צַוָּארוֹ לְמַעְלָה מֵהַסַכִּין הַנְּעוּצָה אוֹ לְמַטָּה מִמֶּנָּה, שְׁחִיטָתוֹ כְּשֵׁרָה.
Seif 4
If someone inserts a knife into a wall, and passes it across the neck (of an animal) until it is slaughtered, it is permissible, provided that the animals neck is below and the knife above, if the neck of the animal will be above the knife, it is possible that the animal will descend with the weight of its body [on the knife] and cut [its throat] without [it being brought back and forth].
This is not considered as being slaughtered ritually, Even if he says I am sure that it (the animal) didn’t trample (it neck) over it (the knife), the slaughter is invalidated, therefore, if it was a fowl, whether its neck is above the knife that is implanted or below it, the slaughter is acceptable.