ט אמר רבא אשה לא תעמוד על גבי כלי חרס ותטבול סבר רב כהנא למימר טעמא מאי משום גזירת מרחצאות הא על גבי סילתא שפיר דמי
9 Raba further ruled: If a woman performed immersion, and when she ascended [from the water] an object that caused an interposition was found upon her, she need not wash her head or perform immersion again if her immersion was performed immediately after the washing of her head;<span class="x" onmousemove="('comment',' It being assumed in such a case that the interposition became attached to the body after the immersion. ');"><sup>22</sup></span> otherwise, she must wash her head and perform immersion again. There are others who say: If she performed her immersion on the same day on which she washed her head, she need not wash her head or perform immersion again, otherwise she must wash her head and perform immersion again. What is the practical difference between them?<span class="x" onmousemove="('comment',' The two readings. ');"><sup>23</sup></span> — The practical difference between them is the question whether immersion must follow immediately upon the washing of the head,<span class="x" onmousemove="('comment',' According to the first reading it must. ');"><sup>24</sup></span> and whether a woman may wash her head during the day and perform her immersion at night.