利未记 18:17

不可露了妇人的下体，又露她女儿的下体，也不可娶她孙女或是外孙女，露她们的下体；她们是骨肉之亲，这本是大恶。

Thou shalt not uncover the nakedness of a woman and her daughter, neither shalt thou take her son’s daughter, or her daughter’s daughter, to uncover her nakedness; for they are her near kinswomen: it is wickedness.