Commentary for Keritot 43:22

וליטעמיך מי לא קתני דם כליות וקתני דם אברים

R'Johanan says: That which gushes forth; Resh Lakish says: From the black drop onward.<span class="x" onmousemove="('comment',' Thus literally. Rashi explains that when the arteries are cut the escaping blood is at first dark and then red. In its second stage it begins after a while to gush forth with force and when the pressure had ceased the stream weakens and the blood oozes gently. There is thus at the beginning as well as the end a period when the blood escapes in a gentle flow. According to R. Johanan, only the blood that escapes with force is considered the life blood; according to Resh Lakish it is all blood that escapes after the last black drop even when flowing gently.');">¹⁴</span>

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