Reference for Chullin 196:19

זהו היתר הבא מכלל איסור זהו למעוטי מאי לאו למעוטי כל איסורין שבתורה

- Because the Divine Law has expressly stated: And he shall take of the blood of the bullock and of the blood of the goat,<span class="x" onmousemove="('comment',' Lev. XVI, 18. The blood of the goat, although mixed with the blood of the bullock and though considerably less in quantity than the blood of the bullock, nevertheless retains its identity and is not neutralized by the latter, obviously because they are homogeneous substances and cannot neutralize each other.');">¹³</span>

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