[The answer you seek is in The Book of Jasher.]

King James Version Bible

2 John Chapter 1

3. Grace be with you, mercy, [and] peace, from God the Father, and from the Lord Jesus Christ, the Son of the Father, in truth and love.

[Validity of the Book of Jasher]

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2 Samuel Chapter 1

18. (Also he bade them teach the children of Judah [the use of] the bow: BEHOLD, [IT IS] WRITTEN IN THE BOOK OF JASHER.)

Joshua Chapter 10

13. And the sun stood still, and the moon stayed, until the people had avenged themselves upon their enemies. [IS] NOT THIS WRITTEN IN THE BOOK OF JASHER? So the sun stood still in the midst of heaven, and hasted not to go down about a whole day.

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The Book of Jasher: Chapter 1

12. And the Lord God drove them that day from the garden of Eden, to till the ground from which they were taken, and they went and dwelt at the east of the garden of Eden; and Adam knew his wife EVE and she BORE two sons and THREE DAUGHTERS.

33. And at that time Cain went out from the presence of the Lord, from the place where he was, and he went moving and wandering in the land toward the east of Eden, he and all belonging to him.

34. And Cain knew his wife in those days, and she conceived and bare a son, and he called his name Enoch, saying, In that time the Lord began to give him rest and quiet in the earth.

[After the population began to spread and the essence of the tree of life began to vanish in the sons of men DNA, incest became an abomination.]

Leviticus Chapter 18

5. Ye shall therefore keep my statutes, and my judgments: which if a man do, he shall live in them: I [am] the LORD.

6. NONE OF YOU shall approach to any that is near of kin to him, to uncover [their] nakedness: I [am] the LORD.

9. 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.

Deuteronomy Chapter 27

20. CURSED [be] he that lieth with his father's wife; because he uncovereth his father's skirt. And all the people shall say, Amen.

22. 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.