Deuteronomy

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 hath uncovered his sister’s nakedness; he shall bear his iniquity.

The nakedness of thy sister, the daughter of thy father, or daughter of thy mother, whether she be born at home, or born abroad, even their nakedness thou shalt not uncover.

And one hath committed abomination with his neighbour’s wife; and another hath lewdly defiled his daughter in law; and another in thee hath humbled his sister, his father’s daughter.

So Tamar went to her brother Amnon’s house; and he was laid down. And she took flour, and kneaded it, and made cakes in his sight, and did bake the cakes.

Howbeit he would not hearken unto her voice: but, being stronger than she, forced her, and lay with her.