Reference for Niddah 104:52

אחת זו ואחת זו חוששת

we do not ascribe it to any external cause, Our Rabbis taught: If a woman observed a blood-stain, if it is big enough<span class="x" onmousemove="('comment',' Being of generous dimensions and rather larger than the size of three beans. ');">⁴³</span> to be divided into parts corresponding respectively to three beans, each of which being slightly bigger than the size of a bean, she must take into consideration the possibility of <i>zibah</i>; otherwise, she need not take this possibility into consideration. R. Judah b. Agra citing R. Jose ruled: In the one case and in the other<span class="x" onmousemove="('comment',' Sc. even if the stain was no bigger than the size of two beans. ');">⁴⁵</span> the possibility must be taken into consideration.<span class="x" onmousemove="('comment',' Since it is possible that at least one of the stains was due to a discharge at twilight which counts as two (v. infra). ');">⁴⁶</span>

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