עֶרְוַ֥ת אָבִ֛יךָ וְעֶרְוַ֥ת אִמְּךָ֖ לֹ֣א תְגַלֵּ֑ה אִמְּךָ֣ הִ֔וא לֹ֥א תְגַלֶּ֖ה עֶרְוָתָֽהּ׃ (ס)
Targum Jonathan on Leviticus
The nakedness of thy father, or the nakedness of thy mother, thou shall not dishonour. A woman shall not lie with her father, nor a man with his mother; she is thy mother: thou shalt not discover her nakedness.