Reference for Niddah 42:25

קורעה אם תוכה מאדים טמאה ואם לאו טהורה

but is also the most lenient of all the previous rulings.<span class="x" onmousemove="('comment',' Since according to it blood that is not accumulated (contrary to Symmachus) and a red interior (contrary to R. Aha) are no causes of uncleanness. ');">²¹</span>

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