Leviticus 18:10

New Revised Standard Version Catholic Interconfessional

You shall not uncover the nakedness of your son's daughter or of your daughter's daughter, for their nakedness is your own nakedness.

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You shall not uncover the nakedness of your father's wife's daughter, begotten by your father, since she is your sister.

You shall not uncover the nakedness of your sister, your father's daughter or your mother's daughter, whether born at home or born abroad.