Commentary for Yevamot 109:5

אתה אומר בין מן האב בין מן האם או אינו אלא מן האב ולא מן האם ודין הוא חייב כאן וחייב באחותו מה אחותו בין מן האב בין מן האם אף כאן בין מן האב בין מן האם

is through betrothal, and she is of his own relatives. Whence, however, is [the law concerning] a brother's wife herself derived? — From what was taught: Thou shalt not uncover the nakedness of thy brother's wife,<span class="x" onmousemove="('comment',' Lev. XVIII, 16. ');">¹¹</span> whether he is paternal or maternal. You say, 'Whether he is paternal or maternal', perhaps it is not so, but only when paternal and not when maternal? This is a matter of logical argument: He is subject to a penalty here<span class="x" onmousemove="('comment',' For intercourse with a brother's wife. ');">¹²</span>

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