I Corinthians 5:1
It is reported commonly [that there is] fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father's wife.

Deuteronomy 22:30
A man shall not take his father's wife, nor discover his father's skirt.

Deuteronomy 27:20-23
Cursed [be] he that lieth with his father's wife; because he uncovereth his father's skirt. And all the people shall say, Amen. Cursed [be] he that lieth with any manner of beast. And all the people shall say, Amen. Cursed [be] he that lieth with his sister, the daughter of his father, or the daughter of his mother. And all the people shall say, Amen. Cursed [be] he that lieth with his mother in law. And all the people shall say, Amen.

Leviticus 18:6-18
None of you shall approach to any that is near of kin to him, to uncover [their] nakedness: I [am] the LORD. The nakedness of thy father, or the nakedness of thy mother, shalt thou not uncover: she [is] thy mother; thou shalt not uncover her nakedness. The nakedness of thy father's wife shalt thou not uncover: it [is] thy father's nakedness. 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. The nakedness of thy son's daughter, or of thy daughter's daughter, [even] their nakedness thou shalt not uncover: for theirs [is] thine own nakedness. The nakedness of thy father's wife's daughter, begotten of thy father, she [is] thy sister, thou shalt not uncover her nakedness. Thou shalt not uncover the nakedness of thy father's sister: she [is] thy father's near kinswoman. Thou shalt not uncover the nakedness of thy mother's sister: for she [is] thy mother's near kinswoman. Thou shalt not uncover the nakedness of thy father's brother, thou shalt not approach to his wife: she [is] thine aunt. Thou shalt not uncover the nakedness of thy daughter in law: she [is] thy son's wife; thou shalt not uncover her nakedness. Thou shalt not uncover the nakedness of thy brother's wife: it [is] thy brother's nakedness. Thou shalt not uncover the nakedness of a woman and her daughter, neither shalt thou take her son's daughter, or her daughter's daughter, to uncover her nakedness; [for] they [are] her near kinswomen: it [is] wickedness. Neither shalt thou take a wife to her sister, to vex [her], to uncover her nakedness, beside the other in her life [time].

Leviticus 20:11-12
And the man that lieth with his father's wife hath uncovered his father's nakedness: both of them shall surely be put to death; their blood [shall be] upon them. And if a man lie with his daughter in law, both of them shall surely be put to death: they have wrought confusion; their blood [shall be] upon them.

Leviticus 20:17-18
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. And if a man shall lie with a woman having her sickness, and shall uncover her nakedness; he hath discovered her fountain, and she hath uncovered the fountain of her blood: and both of them shall be cut off from among their people.