Leviticus 18:9

9 aYou shall not uncover the nakedness of your sister, your father’s daughter or your mother’s daughter, whether brought up in the family or in another home.

Leviticus 20:17

17 b“If a man takes his sister, a daughter of his father or a daughter of his mother, and sees her nakedness, and she sees his nakedness, it is a disgrace, and they shall be cut off in the sight of the children of their people. He has uncovered his sister’s nakedness, and he shall bear his iniquity.

2 Samuel 13:1

Amnon and Tamar

1Now cAbsalom, David’s son, had a beautiful sister, whose name was dTamar. And after a time Amnon, David’s son, loved her.

2 Samuel 13:8-14

8So Tamar went to her brother Amnon’s house, where he was lying down. And she took dough and kneaded it and made cakes in his sight and baked the cakes. 9And she took the pan and emptied it out before him, but he refused to eat. And Amnon said, eSend out everyone from me.” So everyone went out from him. 10Then Amnon said to Tamar, “Bring the food into the chamber, that I may eat from your hand.” And Tamar took the cakes she had made and brought them into the chamber to Amnon her brother. 11But when she brought them near him to eat, he took hold of her and said to her, “Come, lie with me, my sister.” 12She answered him, “No, my brother, do not violate
Or humiliate; also verses 14, 22, 32
me, for gsuch a thing is not done in Israel; do not do this houtrageous thing.
13As for me, where could I carry my shame? And as for you, you would be as one of ithe outrageous fools in Israel. Now therefore, please speak to the king, for he will not withhold me from you.” 14But he would not listen to her, and being stronger than she, he violated her and lay with her.

Ezekiel 22:11

11 jOne commits abomination with his neighbor’s wife; kanother lewdly defiles his daughter-in-law; lanother in you violates his sister, his father’s daughter.
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