Reference for Ketubot 150:8

א"ל משנתארסה משום דאיכא למימר חזקה אין אדם שותה בכוס אא"כ בודקו והאי ראה וניפייס הוא

He said back: [The principle cannot be applied if the defects were discovered] after she had been betrothed because we can assume that no man drinks out of a cup unless he has first examined it; and this man must consequently have seen [the defects] and acquiesced.

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