3יִשְׂרָאֵל הַדָּשׁ בְּפָרָתוֹ שֶׁל עַכּוּ"ם עוֹבֵר מִשּׁוּם בַּל (דברים כה ד) "תַחְסֹם". וְהָעַכּוּ"ם הַדָּשׁ בְּפָרָתוֹ שֶׁל יִשְׂרָאֵל אֵינוֹ עוֹבֵר מִשּׁוּם בַּל תַחְסֹם. אָמַר לְעַכּוּ"ם חֲסֹם פָּרָתִי וְדוּשׁ בָּהּ. יָשַׁב לָהּ קוֹץ בְּפִיהָ וְדָשׁ בָּהּ וַהֲרֵי אֵינָהּ אוֹכֶלֶת. הִרְבִּיץ לָהּ אֲרִי מִבַּחוּץ אוֹ שֶׁהִרְבִּיץ בְּנָהּ מִבַּחוּץ. הֲרֵי שֶׁצָּמְאָה וְאֵינוֹ מַשְׁקֶה אוֹתָהּ. פָּרַס עוֹר עַל גַּבֵּי הַדַּיִשׁ כְּדֵי שֶׁלֹּא תֹּאכַל. כָּל זֶה וְכַיּוֹצֵא בּוֹ אָסוּר וְאֵינוֹ לוֹקֶה. הָיָה הַדָּבָר שֶׁהִיא עוֹשָׂה בּוֹ רַע לִבְנֵי מֵעֶיהָ וּמַזִּיקָהּ אוֹ שֶׁהָיְתָה חוֹלָה וְאִם תֹּאכַל מִזֶּה מַתְרֶזֶת מֻתָּר לְמָנְעָהּ. שֶׁלֹּא הִקְפִּידָה תּוֹרָה אֶלָּא עַל הֲנָאָתָהּ וַהֲרֵי אֵינָהּ נֶהֱנֵית:
When a Jew threshes with a cow belonging to a gentile, he is subject to violating the prohibition against muzzling. When, by contrast, a gentile threshes with an ox belonging to Jew, he is not subject to violating this prohibition. If a Jew tells a gentile: "Muzzle my ox and thresh with it," a thorn becomes lodged in the ox's mouth and he threshes with it so it does not eat, he places a lion outside the threshing floor, he places the animal's son outside the threshing floor, he does not provide the animal with drink when it is thirsty, or spreads a hide over the grain so that it will not eat - all of these and similar acts are forbidden, but the person does not receive lashes. When the produce with which the animal is working is bad for its digestion and will damage the animal's health or when the animal is sick and eating will cause it to become diarrheic, it is permitted to prevent the animal from eating. The rationale is that the Torah enacted this prohibition so that the animal would benefit, and in such an instance it does not benefit.