Reference for Sanhedrin 116:7

ת"ש מפני מה לא נשא אדם את בתו כדי שישא קין את אחותו שנאמר (תהלים פט, ג) כי אמרתי עולם חסד יבנה הא לאו הכי אסירא

permitted to him. But Abram declared to him [i.e., Abimelech] thus: I am fraternally related to her, [i.e., she is my brother's daughter] on my father's side [i.e., my brother by my father] but not on my mother's side.<span class="x" onmousemove="('comment',' Not that she would have been forbidden in that case, but this was stated merely for the sake of exactness. ');">¹⁰</span>

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