וְעֶרְוַ֨ת אֲח֧וֹת אִמְּךָ֛ וַאֲח֥וֹת אָבִ֖יךָ לֹ֣א תְגַלֵּ֑ה כִּ֧י אֶת־שְׁאֵר֛וֹ הֶעֱרָ֖ה עֲוֺנָ֥ם יִשָּֽׂאוּ׃
Tu ne découvriras point la nudité de la sœur de ta mère ni de la sœur de ton père; car c’est dévoiler la nudité de sa parente: ils doivent en porter la peine.
Mishnah Ketubot
These are girls to whom the fine is due:If one had intercourse with a mamzeret, a netinah, a Samaritan; Or with a convert, a captive, or a slave-woman, who was redeemed, converted, or freed [when she was] under the age of three years and one day. 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 kareth, there is not, with regard to them, a death [penalty inflicted] by the court.