Reference for Zevachim 69:6

אלא רבי יהודה לטעמיה דאמר אין דם מבטל דם

R'Judah is consistent with his view, for he maintained: Blood cannot nullify [other] blood.<span class="x" onmousemove="('comment',' And there is certainly at least a little of the life-blood in this goblet of mixed blood, and that is sufficient for atonement.');">⁹</span> R'Judah said to them [the Sages]: On your view,<span class="x" onmousemove="('comment',' That they did not fill a goblet of mixed blood.');">¹⁰</span>

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