Reference for Niddah 30:11

אימר דאמר רבי יוחנן ספק ראתה ספק לא ראתה ואם תמצא לומר ראתה אימא טבלה אבל ודאי ראתה מי יימר דטבלה

but in a case where it is certain that she had observed a discharge, who could say that she had since performed immersion? And, seeing that it is a question of a doubt<span class="x" onmousemove="('comment',' As to whether there was immersion in consequence of which she would be clean. ');">¹⁰</span>

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