Bible Answers
Where did Cain get his wife?
She was a daughter — or granddaughter — of Adam and Eve. Genesis says Adam lived 930 years and "begat sons and daughters," and in the earliest generations marrying close kin was both unavoidable and not yet forbidden.
The answer is in the text
"And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters" (Genesis 5:4). Adam and Eve had many children beyond Cain, Abel, and Seth — Jewish tradition counts dozens. When Genesis 4:17 says "Cain knew his wife," she was a sister or, given the long lifespans and compressed narrative, possibly a niece. Paul confirms the single-family origin of humanity: God "hath made of one blood all nations of men" (Acts 17:26).
But isn’t that incest?
By later law, yes — sibling marriage is forbidden in Leviticus 18. But that law was given at Sinai, long after the first generations; Abraham himself married his half-sister Sarah without censure (Genesis 20:12). In a genetically fresh humanity, close-kin marriage carried none of the accumulated mutation risks it does now — which is precisely why the prohibition could come later, once the human family had grown and the practice was no longer necessary.
What the question usually misses
"Cain’s wife" is a favorite gotcha for alleged Bible contradictions — but read plainly, the text is compressed, not contradictory. Genesis 4’s actual theme is sin’s rapid spread: from a brother’s murder to Lamech’s revenge song (4:23-24), while God preserves a line of worship — "then began men to call upon the name of the LORD" (4:26). Good reading holds the Bible’s silences with humility and its message with both hands.
Related Bible Verses
- Genesis 5:4"Sons and daughters" — the recorded answer.
- Acts 17:26One blood — humanity’s single origin.
- Genesis 20:12Abraham and Sarah — before the later prohibition.