Nedarim

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?  Or perhaps, 'and her husband heard it'  is not indispensable? — Said Raba, Come and hear: 'And her husband heard', — this excludes the wife of a deaf man. This proves it. The scholars propounded: Can a husband disallow [the vows of] his two wives simultaneously: is the word 'her' particularly stated, or not?  — Said Rabina, Come and hear: Two suspected wives are not made to drink  simultaneously, because each is emboldened  by her companion.  R. Judah said: It is not [forbidden] on that score, but because it is written, and he shall make her drink.'  implying, her alone.