Reference for Eruvin 197:12

ורבי יוסי מטהר רבי יהודה אומר היפך בה טמא לא היפך בה טהור

You must consequently admit that<span class="x" onmousemove="('comment',' Lit., 'but'. erz');">¹⁹</span> the man's intention<span class="x" onmousemove="('comment',' [That it should drop into the fire or into the dog's mouth, v. Tosaf s.v. ].');">²⁰</span> confers upon it<span class="x" onmousemove="('comment',' The dog's mouth or the flames of the furnace.');">²¹</span>

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