Commentary for Ketubot 57:2

הבא על אחותו ועל אחות אביו ועל אחות אמו ועל אחות אשתו ועל אשת אחיו ועל אשת אחי אביו ועל הנדה יש להם קנס אע"פ שהן בהכרת אין בהן מיתת בית דין:

If one had intercourse with his sister, with the sister of his father, with the sister of his mother, with the sister of his wife, with the wife of his brother, with the wife of the brother of his father, or with a woman during menstruation, he has to pay the fine, [for] although these are punishable through karet, there is not, with regard to them, a death [penalty inflicted] by the court.

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