(Bamidbar 30:12) "and her husband heard": to exclude one who was deaf. "And her husband heard": This tells me only of one who himself heard (the vow). Whence do I derive (the same for) his being informed by others? From (13) "on the day of his hearing," "and he was silent to her": to (the end of) confirmation.
You say this, but perhaps (the "silence" intended is the silence of) taunting. (This cannot be, for (Ibid. 15) "And if her husband be silent to her from day to day" already speaks of (the silence of) taunting. How, then, am I to understand "and he was silent to her"? As referring to (the silence of) confirmation. (Ibid. 12) "then all of her vows shall stand": If she vowed and he confirmed (her vow by his silence), and he later annulled it, I might think that it is annulled.
And how would I understand "then all of her vows shall stand"? If he did not annul them. Or, even if he did annul them, and how would I understand "and he annul her vow"? If he had not confirmed it. Or, even if he did confirm it? It is, therefore, written (Ibid. 12) "shall stand."