If a man marries his sister, whether the daughter of his father or of his mother, and they have sexual relations, it is a disgrace. They must be cut off in the sight of their people. He has uncovered the nakedness of his sister; he shall bear his iniquity.

Leviticus 18:9
You must not have sexual relations with your sister, either your father's daughter or your mother's daughter, whether she was born in the same home or elsewhere.

Leviticus 20:16
If a woman approaches any animal to mate with it, you must kill both the woman and the animal. They must surely be put to death; their blood is upon them.

Numbers 5:31
The husband will be free from guilt, but the woman shall bear her iniquity."

Deuteronomy 27:22
Cursed is he who sleeps with his sister, the daughter of his father or the daughter of his mother.' And let all the people say, 'Amen!'

2 Samuel 13:12
"No, my brother!" she cried. "Do not humiliate me, for such a thing should never be done in Israel. Do not do this disgraceful thing!

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 has uncovered his sister's nakedness; he shall bear his iniquity.