Leviticus 18:7 BBE

⁵  So keep my rules and my decisions, which, if a man does them, will be life to him: I am the Lord.

⁶  You may not have sex connection with anyone who is a near relation: I am the Lord.

⁷  You may not have sex relations with your father or your mother: she is your mother, you may not take her.

⁸  And you may not have sex relations with your father's wife: she is your father's.

⁹  You may not take your sister, the daughter of your father or of your mother, wherever her birth took place, among you or in another country.