驳「既已准许,便一概准许」之说:若亡兄先娶、在世兄弟后娶其姐妹,兄弟之妻的禁令既因转房诫命而解,或可说妻子姐妹的禁令也随之而解。
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若是亡兄先娶了姐妹中的一个,她因此作为兄弟之妻而禁归 亡夫兄弟,之后在世的兄弟才娶了她的姐妹,使这位兄弟之妻又以另一重名目——妻子的姐妹——禁归于他,这样说还说得通。
This works out well when the deceased brother had first married one of the sisters, who was thereby rendered prohibited to the yavam as his brother’s wife, and only afterward had the living brother married her sister, which renders his brother’s wife forbidden to him on another count, this time as his wife’s sister.
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因为在这种情形下可以说:既然先有的兄弟之妻这一禁令,后来因转房的诫命而解除、成为许可,那么妻子姐妹这一禁令也就一并解除、成为许可了。
As in that case one can say that since the first prohibition with regard to a brother’s wife was subsequently nullified and thereby permitted by the mitzva of levirate marriage, the prohibition with regard to a wife’s sister was also nullified and thereby permitted.