Reference for Ketubot 19:9

והא רב נחמן הוא דאמר מהימן מהימן ומסבינן ליה כופרי רב אחאי משני כאן בבחור כאן בנשוי

But it is R. Nahman who said that he [the husband] is believed! He is believed, but they also lash him with palm-branches. Ahai answered: Here [it refers] to a young man, there [it refers] to one was married before.

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