Leviticus 20:17

“ ‘If a man marries his sister, the daughter of either his father or his mother, and they have sexual relations, it is a disgrace. They are to be publicly removed from their people. He has dishonored his sister and will be held responsible.

If a man marries his sister, whether his father’s daughter or his mother’s daughter, and they have sexual relations, it is a disgrace. They are to be cut off publicly from their people. He has had sexual intercourse with his sister; he will bear his iniquity.

“If a man marries his sister, the daughter of either his father or his mother, and they have sexual relations, it is a shameful disgrace. They must be publicly cut off from the community. Since the man has violated his sister, he will be punished for his sin.

“ ‘As for a man who takes his sister, his father’s daughter or his mother’s daughter, and he sees her nakedness and she herself sees his nakedness, it is a disgrace, and they shall be cut off before the eyes of their people; he has exposed his sister’s nakedness—he must bear his guilt.

And if a man shall take his sister, his father’s daughter, or his mother’s daughter, and see her nakedness, and she see his nakedness; it is a wicked thing; and they shall be cut off in the sight of their people: he hath uncovered his sister’s nakedness; he shall bear his iniquity.