Numbers 30:5

In the day that he heareth, i.e. speedily, or without delay, allowing only necessary and convenient time for deliberation. And it is hereby intimated, that the day or time he had for disallowing her vow was not to be reckoned from her vowing, but from his hearing or knowledge of her vow. Shall forgive her; or, will forgive either her rashness of making such vows, or rather her not performing of it. But this is to be understood only of such vows which could not be performed without invading the father's or superior's right; for if one should vow to forbear such or such a sin, and all unnecessary occasions or means leading to it, and to perform such or such duties, when he had opportunity, no father nor superior can discharge him from such vows.