Commentary for Nedarim 46:4

רב הונא בר חיננא סבר למידרשיה בפירקא אמר ליה רבא תנא קא מסתים לה סתומי כדי שלא ינהגו קלות ראש בנדרים ואת דרשת ליה בפירקא

Here the circumstances are e.g., that one stipulated at the beginning of the year, but does not know in reference to what. Now he vows. Hence, if he remembers [the stipulation] and he declares: 'I vow in accordance with my original intention', his vow has no reality. But if he does not declare thus, he has cancelled his stipulation and confirmed his vow.

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