Midrash for Chullin 70:28
וכי הדם מכשיר
Come and hear: [We have learnt:] R'Simeon says: The blood of a dead [animal]<span class="x" onmousemove="('comment',' Which died a natural death (Rashi) . Tosaf. suggests that it refers to the blood of a human corpse.');"><sup>10</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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