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Find out how we are all descendants of Adam and Eve in this clip from One Blood One Race, part of the Foundations DVD series.

And Cain knew his wife, and she conceived and bore Enoch. (Genesis 4:17)

Perhaps no woman mentioned in Scripture has caused more confusion among Christians. Despite the fact that we have regularly addressed this issue in numerous books, articles, and presentations, the issue of Cain’s wife is still one of the most common questions we receive. Who was she, and why have so many believers struggled to give a biblical answer to this inquiry?

The simple answer is that Cain married his sister or another close relation, like a niece. This answer may sound revolting for those of us who grew up in societies that have attached a stigma to such an idea, but if we start from Scripture, the answer is clear.

1 Corinthians 15:45 tells us that Adam was “the first man.Genesis 3:20 states that Eve “was the mother of all the living” (NASB), and Genesis 5:4 reveals that Adam and Eve “had sons and daughters” (besides Cain, Abel, and Seth).

There were no other people on earth as some have claimed. God did not create other people groups from which Cain chose a wife, as we are all made of one blood (Acts 17:26). If He had made others, these people would not have been able to be saved from their sins, since only descendants of Adam can be saved—that’s why it was so important for Jesus to be Adam’s descendant.

Foundations

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Doesn’t the Bible forbid marriage between close relations? It does, but the laws against marrying family members were initially given as part of the Mosaic covenant, approximately 2,500 years after God created Adam and Eve. Due in part to genetic mistakes, these laws were necessary to help protect offspring from mutations shared by both parents.

But that’s incest! In today’s world, this would be incest. But originally there would have been no problem with it. Looking back through history, the closer we get to Adam and Eve, the fewer genetic mistakes people would have, so it would have been safer for close relatives to marry and have children.

Christians who have a problem with this answer need to remember that Noah’s grandchildren must have married brothers, sisters, or first cousins—there were no other people (1 Peter 3:20; Genesis 7:7). Abraham married his half-sister (Genesis 20:2, 12); Isaac married Rebekah, the daughter of his cousin Bethuel (Genesis 24:15, 67); and Jacob married his cousins Leah and Rachel. Clearly, the Bible does not forbid the marriage of close relatives until the time of Moses.

Also, it is rather ironic for evolutionary skeptics to mock the biblical position that all people are descendants of the first man and woman. These evolutionists believe that all living organisms are descendants of the first living cell that somehow sprang to life from non-living material.

When we start from Scripture, it is easy to see who Cain’s wife was. God’s Word has the answer to this question and so many others like it; we just need to trust what He has revealed.