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Deut. 27:22 ‘Cursed is he who lies with his sister, the daughter of his father or of his mother.’ And all the people shall say, ‘Amen.’
As a Bible believer, that should be enough for you, even if your instinctive universal repugnance at the thought is missing.
Another thing to note: The book of Deuteronomy was written THOUSANDS of years after the creation of Adam and Eve.
Why did God wait so long to define incest as against the law?
Also note that Deuteronomy literally means "second law"; why was this restriction not included in the FIRST law?