TT #641 · Parashas Ki Seitzei · Seventh Aliyah · Passuk 25:04
You shall not muzzle an ox while it is threshing.
Torah Temimah points to Bava Metzia 89a.
TT lemma: בְּדִישׁוֹ.
English: Our Rabbis taught: ‘Threshing’ – just as threshing is distinctive in that it concerns something that grows from the ground and the worker may eat of it, so too for every thing that grows from the ground the worker may eat of it. This excludes the milker, the churner, and the cheese-maker, which are not produce of the ground.
Kelal u-ferat / distinctive feature (Bavli).
A hired worker may eat only from produce that grows from the ground while he is working with it. Dairy processes are excluded.