וְאִ֣ישׁ אֲשֶׁר־יִקַּ֣ח אֶת־אֲחֹת֡וֹ בַּת־אָבִ֣יו א֣וֹ בַת־אִ֠מּוֹ וְרָאָ֨ה אֶת־עֶרְוָתָ֜הּ וְהִֽיא־תִרְאֶ֤ה אֶת־עֶרְוָתוֹ֙ חֶ֣סֶד ה֔וּא וְנִ֨כְרְת֔וּ לְעֵינֵ֖י בְּנֵ֣י עַמָּ֑ם עֶרְוַ֧ת אֲחֹת֛וֹ גִּלָּ֖ה עֲוֺנ֥וֹ יִשָּֽׂא׃
Si un homme épouse sa sœur, fille de son père ou fille de sa mère, qu’il voie sa nudité et qu’elle voie la sienne, c’est un inceste, et ils seront exterminés à la vue de leurs concitoyens: il a découvert la nudité de sa sœur, il en portera la peine.
Targum Jonathan on Leviticus
And if a man lie with his sister, his father's daughter, or the daughter of his mother, and he dishonour her nakedness, it is depravity: for I showed mercy with the first ones, on behalf of the peopling of the world by them, while as yet I had not promulged the law in the world: but after the law hath been declared in the world, every one who committeth these things shall be destroyed by mortality, and the children of their people shall witness their punishment; for he who hath dishonoured the nakedness of his sister shall be guilty of death.