Reference for Nedarim 42:5

ההוא דאתא לקמיה דרב הונא אמר ליה ליבך עלך אמר ליה לא ושרייה

yet you say. absolution must be sought from a Sage! R. Joseph reported this discussion in the following version: Rab Judah said in R. Assi's name: A Sage may remit only such [vows] as are similar to these four. Thus in his view mere regret is not given as an opening [for absolution].<span class="x" onmousemove="('comment',' A definite reason for absolution is necessary, based on a fact which was unknown when the vow was made; consequently, it may be regarded as having been made in error. But if the only reason for cancellation is that the vower regrets it, absolution cannot be granted, v. infra 77b. ');">⁴</span>

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