Reference for Niddah 73:24

אלא לר"א תפשוט דדבר שאינו גורם סותר לרבנן מאי

— Abaye replied: It neither renders void the days that were previously counted<span class="x" onmousemove="('comment',' The counting must be resumed after the clean days of birth have passed. ');">²¹</span>

Jastrow

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