Commentary for Yevamot 14:4

מי דמי התם חד איסורא הכא תרי איסורי מהו דתימא הואיל ואישתרי אישתרי

there is only one prohibition; in the other<span class="x" onmousemove="('comment',' Lit., 'here', a wife's sister. ');">¹³</span> there are two prohibitions!<span class="x" onmousemove="('comment',' The prohibitions to marry (a) a brother's wife and (b) a wife's sister. How then could the one be deduced from the other? ');">¹⁴</span> — It might have been assumed that since she<span class="x" onmousemove="('comment',' A brother's wife who is also one's wife's sister and whose husband died childless. ');">¹⁵</span> was permitted<span class="x" onmousemove="('comment',' By the positive precept of the levirate marriage. ');">¹⁶</span>

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