Reference for Niddah 119:37

עד כאן לא קאמר רבי התם אלא דתרוייהו כי הדדי נינהו הכא מאי נפקא לן מינה

— It might have been presumed that only the woman on whom the stain was found shall be at a disadvantage while the other shall not be disadvantaged, hence we were informed that both are at a disadvantage.

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