Reference for Niddah 114:53

ה"ד

for if it had emanated from herself it should have been found on her body. 'And if you prefer I might reply that it was above her belt', in a case, for instance, where she jumped backwards. If the stain is on her body it must undoubtedly have emanated from herself, for if it had emanated from an external source<span class="x" onmousemove="('comment',' Lit., 'from the world'. ');">⁴³</span>

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