3Ye shall not do according to the devices of Egypt, in which ye dwelt: and according to the devices of the land of Chanaan, into which I bring you, ye shall not do; and ye shall not walk in their ordinances.
4Ye shall observe my judgments, and shall keep my ordinances, and shall walk in them: I am the Lord your God.
5So ye shall keep all my ordinances, and all my judgments, and do them; which if a man do, he shall live in them: I am the Lord your God.
6No man shall draw nigh to any of his near kindred to uncover their nakedness; I am the Lord.
7Thou shalt not uncover the nakedness of thy father, or the nakedness of thy mother, for she is thy mother; thou shalt not uncover her nakedness.
8Thou shalt not uncover the nakedness of thy father's wife; it is thy father's nakedness.
9The nakedness of thy sister by thy father or by thy mother, born at home or abroad, their nakedness thou shalt not uncover.
10The nakedness of thy son's daughter, or thy daughter's daughter, their nakedness thou shalt not uncover; because it is thy nakedness.
Leviticus 18
Leviticus 18:3-10