Reference for Niddah 42:18

מביאה קרבן ונאכל לפי שאי אפשר לפתיחת הקבר בלא דם

but also more restrictive than the ruling of Symmachus.<span class="x" onmousemove="('comment',' He required accumulated blood while here mere redness is regarded as a cause of uncleanness. ');">¹⁵</span>

Jastrow

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