Leviticus 18:11-13

¹¹Thou shalt not show the filthhood of the daughter of the wife of thy father, which she childed to thy father, and she is thy sister.

¹²Thou shalt not open the filthhood of thy father’s sister, for she is the flesh of thy father.

¹³Thou shalt not show the filthhood of the sister of thy mother, for she is the flesh of thy mother.