Reference for Chullin 61:52

רבי נתן היא

Raba said to R'Nahman, against Rab's view that she is allowed intimacy with her husband, but is forbidden to eat terumah, [I would put the question:] If you have permitted her that which entails the penalty of kareth,<span class="x" onmousemove="('comment',' The penalty for having sexual intercourse with a menstruous woman is Kareth, i.e., excision, being cut off. V. Lev. XX. 18.');">¹⁴</span>

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