Deuteronomy 27:22
""Cursed is the one who has sexual relations with his sister, the daughter of his father or mother.' "Then all the people are to respond by saying, "Amen!'
Leviticus 18:9
"You are not to have sexual relations with your sister, whether she's your father's daughter or your mother's daughter, whether she's born in your home or outside your home. You are not to have sexual relations with her.
Leviticus 20:17
"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.
Ezekiel 22:11
One of you commits detestable practices with his neighbor's wife. Another sexually defiles his daughter-in-law. Another humiliates his sister, his own father's daughter.
2 Samuel 13:1
Sometime after this, David's son Amnon fell in love with David's other son Absalom's beautiful sister Tamar.
2 Samuel 13:8-14
Tamar went to her brother Amnon's home, where he was lying down. She brought along some dough, kneaded it, prepared some cakes especially for him, baked them,