Leviticus 18:9
Book: Leviticus 18
The nakedness of thy sister, the daughter of thy father, or the daughter of thy mother, whether born at home, or born abroad, even their nakedness thou shalt not uncover.
Deuteronomy 7:3
Book: Deuteronomy 7
neither shalt thou make marriages with them; thy daughter thou shalt not give unto his son, nor his daughter shalt thou take unto thy son.