Reference for Chullin 72:37

משקי בית מטבחיא לא דיין שהן דכן אלא שאין מכשירין

which teaches that blood which is poured out as water renders food susceptible to uncleanness, but blood which is not poured out as water does not.<span class="x" onmousemove="('comment',' And the blood of consecrated animals is required for sprinkling upon the altar.');">¹³</span>

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