Commentary for Ketubot 143:13

לא צריכא דאמרה ליה פלוני חכם טיהר לי את הדם ואזל שייליה ואשתכח שיקרא ואיבעית אימא כדרב יהודה דאמר רב יהודה הוחזקה נדה בשכינותיה בעלה לוקה עליה משום נדה:

It was necessary only in the case where she said to her husband, “So-and-so the sage told me that the blood was clean,” and when her husband went and asked him it was found that her statement was untrue. If you prefer I might say in accordance with the ruling of Rav Judah, for R. Judah said: If a woman was known among her neighbors to be a menstruant her husband is flogged on her account for [having intercourse with] a menstruant.

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