Reference for Ketubot 46:11
אני וחברתי טהורה ואמר לה עד אחד את וחברתך טמאה איהי כיון דאיכא עדים לאו כל כמינה חברתה משתריא אפומא דידה הא תו למה לי היינו רישא דרישא
[If she says] “I and my friend are pure,” and the one witness says to her, “You and your friend are impure,” since there are witnesses, she is not believed, [and] her friend becomes permitted through her testimony. What need is there again for this? It is the same as in the very first clause!
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