Commentary for Niddah 115:41

והתניא

or where it runs across the breadth of her thigh? — Come and hear: 'A bloodstain on her body concerning which there is doubt whether it is unclean or clean, is regarded as unclean'. Now does not 'on her body' imply stains of such shapes? — No, it might only refer to one that is shaped like a stripe.<span class="x" onmousemove="('comment',' Running downwards, which is the natural shape that may be expected if the blood was menstrual. ');">³⁶</span>

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