Reference for Niddah 135:10
הדר אוקי רבא אמורא עליה ודרש
wash her head in the day time and perform immersion at night seeing that it is required that immersion should closely follow the washing of the head, which would not be the case here. But the law is that a woman may wash her head in the day time and perform immersion at night. And the law is that a woman may wash her head at night only.<span class="x" onmousemove="('comment',' Sc. immediately before immersion. ');"><sup>9</sup></span>
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