Liturgy for Niddah 122:23
עמרא וכיתנא בהדדי לא סליק להו צבעא וכיון דלא ידיע אימר מנתר נתר
The other replied: It is in our Mishnah, for we have learnt, ONE CONTINUES THE EXAMINATION OF THE HEAP UNTIL ONE REACHES BEDROCK; and if it<span class="x" onmousemove="('comment',' The unclean object. ');"><sup>20</sup></span>
Seder Ma'amadot
Gemara (Niddah 61b:3)
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