Reference for Niddah 28:5

אמר לו

Rabbi, however, holds the opinion that it is necessary for the stain to be slightly bigger than the size of a bean in order to exclude the possibility of its being the blood of a louse, but as soon as this possibility is ruled out the blood must undoubtedly have come from her body. Now did not this occur<span class="x" onmousemove="('comment',' Lit., 'he stood'. ');">⁵</span>

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