Midrash for Chullin 70:30
ה"ק להן
Now it is to be inferred from this, is it not, that the blood of a slaughtered animal will render foodstuffs susceptible to uncleanness? - No, the inference to be drawn is that the blood of a slain<span class="x" onmousemove="('comment',' I.e., killed, but not according to the ritual method of slaughtering.');"><sup>12</sup></span>
Sifrei Devarim
"On the earth shall you spill it as water": Just as it is permitted to derive benefit from water, it is permitted to derive benefit from blood — Just as water renders seed susceptible (of incurring tumah), so, blood. Just as water need not be covered, so blood (that of a disqualified offering which has been slaughtered) need not be covered.
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