Leviticus 18:3-7
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3After the doings of the land of Egypt, wherein ye dwelt, shall ye not do: and after the doings of the land of Canaan, whither I bring you, shall ye not do; neither shall ye walk in their statutes. 4Mine ordinances shall ye do, and my statutes shall ye keep, to walk therein: I am Jehovah your God. 5Ye shall therefore keep my statutes, and mine ordinances; which if a man do, he shall live in them: I am Jehovah.
6None of you shall approach to any that are near of kin to him, to uncover [their] nakedness: I am Jehovah. 7The nakedness of thy father, even the nakedness of thy mother, shalt thou not uncover: she is thy mother; thou shalt not uncover her nakedness.
Leviticus 18:3-7 (ASV)