Commentary for Yevamot 108:18

תלמוד לומר ערות אחות אביך לא תגלה בין מן האב בין מן האם ערות אחות אמך לא תגלה בין מן האב בין מן האם

so here also<span class="x" onmousemove="('comment',' With one's father's sister. ');">³⁸</span> when she is paternal and not when maternal! — Let us consider whom it more closely resembles. A prohibition which is natural<span class="x" onmousemove="('comment',' Due to birth. A father's sister is forbidden from birth. ');">⁴³</span> ought to be inferred from a prohibition which is also natural<span class="x" onmousemove="('comment',' One's own sister, whose prohibition also begins at birth. ');">⁴⁴</span>

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