Commentary for Yevamot 108:20

ואי כתב רחמנא באחות אם שכן ודאית אבל אחות אב אימא לא צריכא

should be inferred from the relatives of a father<span class="x" onmousemove="('comment',' The wife of his father's brother. ');">⁴⁰</span> but let no proof be adduced from a sister who is one's own relative! Hence it was stated,<span class="x" onmousemove="('comment',' In addition to the prohibition in Lev. XX, 19, And thou shalt not uncover the nakedness of thy mother's sister nor of thy father's sister. ');">⁴⁸</span> Thou shalt not uncover the nakedness of thy father's sister,<span class="x" onmousemove="('comment',' Lev. XVIII, 12. ');">⁴⁹</span>

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