Liturgy for Niddah 122:28
מתקיף לה רב אשי
but it is only the Rabbis who imposed a prohibition on it,<span class="x" onmousemove="('comment',' On a material that does not satisfy all the three requirements. ');"><sup>24</sup></span>
Seder Ma'amadot
Gemara (Niddah 61b:3)
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