Reference for Yevamot 74:1

הלכתא אהלכתא

between one <i>halachah</i> and the other. Said Abaye: Whence do I infer that R. Eliezer b. Jacob treats any doubtful case as a certainty? — [From] what was taught: R. Eliezer b. Jacob said, 'Behold, when a man has intercourse with many women and does not know with which particular woman<span class="x" onmousemove="('comment',' Among those who had issue from their unlawful connection. ');">¹</span>

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