Genesis 4:17—Where did Cain get his wife?
Solution: Cain married his sister (or possibly a niece). The Bible says Adam “begot sons and daughters’’ (Gen. 5:4). In fact, since Adam lived 930 years (Gen. 5:5), he had plenty of time for plenty of children! Cain could have married one of his many sisters, or even a niece, if he married after his brothers or sisters had grown daughters. In that case, of course, one of his brothers would have married a sister.
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This excerpt is from When Critics Ask: A Popular Handbook on Bible Difficulties (Wheaton, Ill.: Victor Books, 1992). © 2014 Norman Geisler and Thomas Howe. All rights reserved. Used by permission. Click here to purchase this book.