Reference for Niddah 135:31

בשלמא ספק זבה אמרינן אלא זבה ודאי נמי

as a doubtful zabah,<span class="x" onmousemove="('comment',' Since on the seventh day in the morning she was still unclean and since at twilight of that day it was not ascertained that she was clean, it may well be suspected that there was a discharge on the eighth, ninth and tenth in consequence of which she would become a zabah. ');">²⁸</span>

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