Reference for Yevamot 148:11
רבא אמר בלא מיתה עדיפא נמי לא מצית אמרת אמר קרא נפש איזהו דבר ששוה בכל נפש הוי אומר זה מעשר
but where a man is liable to an atonement it might be said that [purification is not complete] until he has brought the atonement! — Abaye replied: Two Scriptural texts are recorded in the case of a woman in childbirth.<span class="x" onmousemove="('comment',' Who is liable to bring a sacrifice. ');"><sup>38</sup></span> It is written, Until the days of her purification be fulfilled,<span class="x" onmousemove="('comment',' Lev. XII, 4. ');"><sup>39</sup></span> as soon as her days are fulfilled she is clean; and it is also written, And the priest shall make atonement for her, and she shall be clean,'<span class="x" onmousemove="('comment',' Ibid. 8. ');"><sup>40</sup></span> how, [then, are the two to be reconciled]?<span class="x" onmousemove="('comment',' According to the former text, cleanness is complete at the conclusion of the prescribed period, while according to the latter the woman cannot be clean before her sacrifices are offered. ');"><sup>41</sup></span>