Reference for Niddah 119:45

א"ל

she has yet to perform the immersion.<span class="x" onmousemove="('comment',' Before doing which she is still unclean in all respects. As Rabbi nevertheless rules out the assumption that the stain was due to her, it is obvious that he would equally rule out the assumption that it was the unclean person who walked in the unclean path. ');">⁴¹</span>

Jastrow

Jastrow