Leviticus 18:17

17 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 wickedness.

Leviticus 18:17 In-Context

15 Thou shalt not uncover the nakedness of thy daughter-in-law: she is thy son's wife; thou shalt not uncover her nakedness.
16 Thou shalt not uncover the nakedness of thy brother's wife: it is thy brother's nakedness.
17 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 wickedness.
18 And thou shalt not take a wife to her sister, to be a rival [to her], to uncover her nakedness, besides the other in her life-time.
19 And thou shalt not approach unto a woman to uncover her nakedness, as long as she is impure by her uncleanness.
The American Standard Version is in the public domain.