Reference for Niddah 40:24

האי דם חימוד הוא

once brought some blood to Rabbah b. Bar Hana who informed her that it was unclean. She then took it 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 is was taught: If a Sage declared [aught] unclean another Sage<span class="x" onmousemove="('comment',' Lit., 'his colleague'. ');">²⁰</span>

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