Deuteronomy 27:22
Cursed is he who has sexual activities with his sister, the daughter of his father or of his mother. All the people answer: Amen.
Leviticus 18:9
Never have sexual intercourse with your stepsister, whether she is your father's daughter or your mother's daughter. It makes no difference whether or not she was born in your house.
Leviticus 20:17
If a man marries his sister or half sister, they must be publicly disgraced and driven out of the community. He has had intercourse with his sister and must suffer the consequences.
Ezekiel 22:11
Some commit adultery, and others seduce their daughters-in-law or their half sisters.
2 Samuel 13:1
David had a beautiful daughter named Tamar. She was Absalom's sister. She was also the half sister of Amnon. Amnon fell in love with her.
2 Samuel 13:8-14
She went there and found him in bed. She prepared dough and made some cakes there where he could see her. Then she baked the cakes.