Leviticus 20:17

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 must be cut off publicly from their people. He has had sexual intercourse with his sister; he will bear his punishment.

Leviticus 18:9

You are not to have sexual intercourse with your sister, either your father’s daughter or your mother’s, whether born at home or born elsewhere. You are not to have sex with her.

Deuteronomy 27:22

‘The one who sleeps with his sister, whether his father’s daughter or his mother’s daughter is cursed.’
And all the people will say, ‘Amen!’

Genesis 20:12

Besides, she really is my sister, the daughter of my father though not the daughter of my mother, and she became my wife.

2 Samuel 13:12

“Don’t, my brother!” she cried. “Don’t humiliate me, for such a thing should never be done in Israel. Don’t do this horrible thing!

Ezekiel 22:11

One man within you commits a detestable act with his neighbor’s wife; another wickedly defiles his daughter-in-law; and yet another violates his sister, his father’s daughter.

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