Reference for Yoma 60:6
ודקארי לה מאי קארי לה משום דקא בעי למרמא אחריתי עליה לשכת המצורעין ששם מצורעין טובלין ר"י אומר לא מצורעין בלבד אמרו אלא כל אדם
R'Judah said: He does not need to immerse himself, for he has done so already on the evening before! This has its own reason, as it was taught: 'Because he had immersed himself on the eve before'.<span class="x" onmousemove="('comment',' R. Judah holds the purpose of the immersion of those who enter the Sanctuary in the morning is just to remind them of their former uncleanness, whereas the leper, who by reason of last night's immersion got rid of his uncleanness, is not in need of another reminder, in form of a second immersion.');"><sup>5</sup></span> What does he ask who asks this?<span class="x" onmousemove="('comment',' I.e., why ask an apparently unnecessary question? The answer is obvious. Mielziner (Introduction p. 238) cites Frankel MGWJ 1861 for a tradition according to which all passages in the Talmud introduced by this phrase belong to the additions made by the Saboraim.');"><sup>6</sup></span>