Reference for Niddah 114:43

על בשרה ספק טמא ספק טהור טמא

to say that three forms of doubt appertain to a woman. A bloodstain on her body, concerning which there is doubt whether it is unclean and clean, is regarded as unclean;<span class="x" onmousemove="('comment',' This is explained infra. ');">³⁸</span>

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