Reference for Chullin 143:26

ור' ישמעאל גולל ודופק הלכתא גמירי לה

For it is written: Whosoever toucheth a dead body [or] the life element of man.<span class="x" onmousemove="('comment',' Num. XIX, 13. Such is the translation of the verse according to R. Ishmael. here means the blood which is the life element in man; cf. Lev. XVII, 14, Deut. XII, 23.');">¹⁷</span>

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