Reference for Bava Metzia 7:3

הָיָה עוֹשֶׂה בְיָדָיו אֲבָל לֹא בְרַגְלָיו, בְּרַגְלָיו אֲבָל לֹא בְיָדָיו, אֲפִלּוּ בִכְתֵפוֹ, הֲרֵי זֶה אוֹכֵל. רַבִּי יוֹסֵי בְּרַבִּי יְהוּדָה אוֹמֵר, עַד שֶׁיַּעֲשֶׂה בְיָדָיו וּבְרַגְלָיו:

If one worked with his hands but not with his feet; with his feet but not with his hands; even with his shoulder, he eats. R. Yossi b. R. Yehudah says: (He does not eat) until he works with his hands and his feet. [Just as an ox, with his hands (forelegs) and feet (hind legs), so a man, with his hands and his feet, the muzzler being likened to the muzzled. The halachah is not in accordance with R. Yossi b. R. Yehudah.]

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