Leviticus 18:6
"A person is not to approach a near blood relative for sexual relations. I am the LORD.
Leviticus 18:7-19
"Neither your father's nakedness nor your mother's nakedness is to be exposed. She's your mother, so you are not to have sexual relations with her.
Leviticus 20:11-12
"If a man has sexual relations with his father's wife, he has exposed his father's nakedness, so both of them are to be put to death. Their guilt will remain their responsibility.
Leviticus 20:17-21
"If a man takes his sister, his father's daughter, or his mother's daughter, so that he exposes her nakedness and she exposes his nakedness, it's a shameful thing. They are to be eliminated from contact with their people in front of their people's children. He has exposed his sister's nakedness. He'll continue to bear responsibility for his iniquity.