Reference for Nedarim 42:6

ההוא דאתא לקמיה דרבה בר רב הונא אמר ליה אילו היו עשרה בני אדם שיפייסוך באותה שעה מי נדרת אמר ליה לא והתירו

A man once came before R. Huna [for absolution]. He asked him: 'Are you still of the same mind?' and he replied 'No!' Thereupon he absolved him. A man once came before Rabbah son of R. Huna, who asked him: 'Had ten men been present to appease you just then, would you have vowed?' On his replying 'No!' he absolved him. It was taught: R. Judah said: We ask him, 'Are you still of the same mind?' If he answers, No!' he is absolved. R. Ishmael son of R. Jose said on his father's authority: We say to him: 'Had ten men been present to appease you just then, would you have vowed?' If he replies in the negative, absolution is granted.

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