Reference for Zevachim 69:5

דם שהנפש יוצאה בו קרוי דם שאין הנפש יוצאה בו אין קרוי דם

blood wherewith life departs is called blood;<span class="x" onmousemove="('comment',' And makes atonement.');">⁷</span> blood wherewith life does not depart is not called blood? - Rather [reply]:<span class="x" onmousemove="('comment',' To the objection, 'But the draining-blood is mixed with it'.');">⁸</span>

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