עֶרְוַ֥ת אִשָּׁ֛ה וּבִתָּ֖הּ לֹ֣א תְגַלֵּ֑ה אֶֽת־בַּת־בְּנָ֞הּ וְאֶת־בַּת־בִּתָּ֗הּ לֹ֤א תִקַּח֙ לְגַלּ֣וֹת עֶרְוָתָ֔הּ שַׁאֲרָ֥ה הֵ֖נָּה זִמָּ֥ה הִֽוא
Thou shalt not uncover the nakedness of a woman and her daughter; thou shalt not take her son’s daughter, or her daughter’s daughter, to uncover her nakedness: they are near kinswomen; it is lewdness.
Targum Jonathan on Leviticus
The nakedness of a woman and of her daughter thou shalt not dishonour, neither shalt thou take her son's daughter or the daughter of her daughter, to dishonour their nakedness; for they are of kin to her flesh; it is corruption.