Deuteronomy 27:22-24
From Reconciling understandings of Scripture and Science
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RSV
22 `Cursed be he who lies with his sister, whether the daughter of his father or the daughter of his mother.' And all the people shall say, `Amen.'
23 `Cursed be he who lies with his mother-in-law.' And all the people shall say, `Amen.'
24 `Cursed be he who slays his neighbor in secret.' And all the people shall say, `Amen.'
Under the Law of Moses, marriage with a sister or half-sister (v. 22) was forbidden and cursed, on a par with murder of a neighbour (v. 24). For this reason Primordial Incest is a very unlikely understanding of the story of Cain and Abel, arising from an effort to accommodate Literal Reading. See discussion at Introducing the Fourth Conversation and links from there.
