The Bible opens with one of many mysteries—where did Cain get his wife? Some people think it’s trivia, but it’s not. The gospel is involved.
Who was Cain’s wife? Who cares? At first glance, who Cain married seems little more than Bible trivia. But linger on it and you’ll discover important implications for the gospel.Genesis 4:1-17- And Adam knew Eve his wife; and she conceived, and bare Cain, and said, I have gotten a man from the LORD. And she again bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground. And in process of time it came to pass, that Cain brought of the fruit of the ground an offering unto the LORD. And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the LORD had respect unto Abel and to his offering: But unto Cain and to his offering he had not respect. And Cain was very wroth, and his countenance fell. And the LORD said unto Cain, Why art thou wroth? and why is thy countenance fallen? If thou doest well, shalt thou not be accepted? and if thou doest not well, sin lieth at the door. And unto thee shall be his desire, and thou shalt rule over him. And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him. And the LORD said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother's keeper? And he said, What hast thou done? the voice of thy brother's blood crieth unto me from the ground. And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand; When thou tillest the ground, it shall not henceforth yield unto thee her strength; a fugitive and a vagabond shalt thou be in the earth. And Cain said unto the LORD, My punishment is greater than I can bear. Behold, thou hast driven me out this day from the face of the earth; and from thy face shall I be hid; and I shall be a fugitive and a vagabond in the earth; and it shall come to pass, that every one that findeth me shall slay me. And the LORD said unto him, Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold. And the LORD set a mark upon Cain, lest any finding him should kill him. And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden. And Cain knew his wife; and she conceived, and bare Enoch: and he builded a city, and called the name of the city, after the name of his son, Enoch.
Here’s the concern: Adam and Eve had Cain and Abel, Cain killed Abel, and then Cain went off and had a family with his wife. But where did Cain’s wife come from? It’s an age-old question with at least two distinct gospel consequences.
First, the unbeliever uses this sort of question to dismiss the gospel.
You see, many people today don’t believe the gospel because they don’t believe the book from which the gospel comes. They are convinced that the Bible has been disproved by evolution and its supposed ape-men, rocks that are billions of years old, and so on.
So a question like, “Where did Cain get his wife?” can be a real obstacle for them. If a Christian’s answer is, “I don’t know, but the important thing is to trust in Jesus!” their logical response is, “Why? If the Bible is wrong about history, then why trust what it says about eternal salvation?” The evolutionary view of history undermines the Bible’s authority, including what it says about sin and salvation.
Second, the believer’s response can distort the gospel.
Sadly, many Christians reject the history documented in Genesis and concede that God may have used evolution or created different people groups at the beginning. In that case, Cain’s wife would have come from people not descended from Adam. But this leads to a tragic, unintended gospel distortion. If some people are not descended from Adam, then the gospel is not for all people! Christ had to be made like us, “his brethren,” so He could redeem us. That means we must be related to Him to be saved.
Hebrews 2:17- Wherefore in all things it behoved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people.
Thankfully, we are related to Jesus Christ through our common ancestor Adam. God’s Word tells us all people are descendants of Adam, and all people are sinners by nature and by choice and are under the judgment of death.
Romans 5:12- Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
Romans 3:23- For all have sinned, and come short of the glory of God;
Since it was man who brought sin and death into God’s perfect creation, humanity needed one of its own to pay the perfect, infinite price to satisfy God’s righteous wrath. But how, since “all have sinned and fall short”? Wonder of wonders, God became flesh! God the Son became the perfect man, the Last Adam. He is of our blood, yet sinless—the just, perfect, infinite kinsman redeemer. Dying on the Cross, Christ paid our debt, absorbed God’s wrath due us, that those shackled by sin in the first Adam may repent and believe to receive salvation through the Last Adam.
I Corinthians 15:21-22,45- For since by man came death, by man came also the resurrection of the dead. For as in Adam all die, even so in Christ shall all be made alive. And so it is written, The first man Adam was made a living soul; the last Adam was made a quickening spirit.
Bottom line, only descendants of the first Adam can be saved by the blood of the Last Adam, Jesus Christ.
With the gospel implications grasped, it’s time to answer the question at hand.
Genesis 3:20- And Adam called his wife's name Eve; because she was the mother of all living.
Acts 17:26- And hath made of one blood all nations of men for to dwell on all the face of the earth, and hath determined the times before appointed, and the bounds of their habitation;
The Bible is clear that Adam was the first man, Eve is the “mother of all living”, and all humans are of “one blood”. The fact that all people are descendants of Adam and Eve means there is only one biological race. (It’s also the reason we’re all sinners in need of a Savior.)
So, who did Cain marry? Genesis 5:4 is the key: “And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters:”. Jewish tradition suggests that Adam and Eve had 33 sons and 23 daughters. That means originally, close relatives like brothers and sisters married. So Cain married a sister or possibly a niece.
But wait—you can’t marry your relation, can you? Well, since there’s only one race, if you don’t marry a relative, you’re not marrying a human and you’ve really got problems! Abraham was married to his half-sister and it was not an issue. Until the time of Moses, 2,500 years after creation, God did not prohibit the marrying of close relatives (Leviticus 18:6- None of you shall approach to any that is near of kin to him, to uncover their nakedness: I am the LORD.).
But why was marrying a close relative originally okay and later forbidden by God? One reason people don’t marry close relatives today is that humans have accumulated mutations (damaged genetic information) within their DNA for thousands of years. Close relatives are likely to have mutations in common, which if passed on by both parties often result in genetic disease. If a person marries a more distant relation, they are less likely to have the same mutations, so they are less likely to pass genetic disease on to their children.
Adam and Eve were genetically perfect, preprogrammed straight from the hand of God. So there would be no genetic mutation occurring through the combination of their DNA.
— Bryan Osborne