Reference for Niddah 40:40

מעיקרא טמויי הוה מטמי לה כיון דא"ל

to R. Isaac the son of Rab Judah who told her that it was clean. But how could he act in this manner, seeing that it was taught: If a Sage declared [a person or an article] unclean no other Sage<span class="x" onmousemove="('comment',' Lit., 'his colleagues'. ');">³⁴</span>

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