Commentary for Nedarim 145:2

בעי רמי בר חמא חרש מהו שיפר לאשתו אם תמצא לומר בעל מיפר בלא שמיעה משום דבר מישמע הוא אבל חרש דלאו בר מישמע הוא היינו דר' זירא

Rami b. Hama propounded: Can a deaf man disallow [the vows of] his wife? Now, should you rule that a husband can annul without hearing, that is because he is capable of hearing; but a deaf man, who is incapable of hearing, falls within R. Zera's dictum, viz., That which is eligible for mixing, [the lack of] mixing does not hinder its validity; whilst that which is not eligible for mixing, [the lack of] mixing hinders its validity?<span class="x" onmousemove="('comment',' The reference is to a meal-offering, in which the flour was mixed with oil. Not more than sixty 'esronim ('isaron, pl. 'esronim, is the tenth part of an ephah) could be thoroughly mixed with oil in the vessels used for that purpose. Hence, if a person vowed a meal-offering of sixty-one 'esronim, sixty were brought in one vessel, and one in another. Whereon R. Zera observed, though the meal-offering is in fact valid even if not mixed with oil at all, it must be capable of being mixed, and therefore sixty-one esronim in one utensil would be invalid. So here too, though it may be unnecessary for the husband actually to hear the vow, he must be physically able to hear it. ');">¹</span>

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