Reference for Nedarim 179:5

ומי ידע אי האי קמא אי האי בתרא

whilst the Rabbis maintain: The husband can annul even before the vow takes effect, as it is written, He maketh void the intentions of the crafty.<span class="x" onmousemove="('comment',' Job V, 12, i.e., even when a vow is as yet merely an intention, not having taken effect, it can be annulled. ');">⁵</span>

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