Reference for Chullin 143:28

אמר ר' אושעיא אמר קרא

You must say, it is a quarter log of blood.<span class="x" onmousemove="('comment',' The loss of this quantity of blood is regarded as the loss of vital blood, for this quantity is the minimum necessary for maintaining life in a human being. Log is a liquid measure equal to the capacity of six eggs.');">¹⁸</span>

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