Reference for Shabbat 211:3

והאנן תנן כל המקלקלין פטורין מתניתין רבי יהודה ברייתא רבי שמעון מ"ט דר' שמעון מדאיצטריך קרא למישרא מילה הא חובל בעלמא חייב

and should you say that it is a Mishnah, wounding refers to one who needs [the blood] for his dog, and setting fire, to one who needs the ashes.<span class="x" onmousemove="('comment',' For medical purposes. Then the wounding and setting fire is beneficial, not a damage-effecting labour. ');">⁴</span> But we learnt, ALL WHO EFFECT DAMAGE ARE EXEMPT?<span class="x" onmousemove="('comment',' Which refutes n. Abbahu. ');">⁵</span>

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