Who did Cain marry? Where did Cain’s wife come from?
The Bible does not specifically tell us who Cain’s wife was or where he met her. This is because it is not vital to know. There are other Bible topics, such as faith and repentance, that are more important for us to study.
However, I will give some brief thoughts on Cain’s wife. It makes sense to me that Cain married one of his sisters, or one of his siblings’ children. Remember that Adam and Eve surely had given birth to more children than just Cain, Abel and Seth. In Bible genealogies it is often only the male that is mentioned.
It is important to remember that God did not forbid inter-family marriage until much later when there were enough people to make intermarriage unnecessary (Leviticus 18:6-18). Adam and Eve had a very big genepool and therefore intermarriage would not result in genetic abnormalities. Adam and Eve did not have any genetic defects, and that enabled them and the first few generations of their descendants to have a far greater quality of health than we do now. And thus it was safe for Adam’s children to intermarry. But later on, especially after the flood, the genepool was no longer the same to what Adam and Eve had, and therefore incest often resulted in genetic abnormalities. The human genetic code has become increasingly “polluted” over the centuries as genetic defects are multiplied, amplified, and passed down from generation to generation.
When two people of similar genetics, like a brother and sister, have children together, there is a high risk that their recessive characteristics become dominant. But when people from different families have children, it is highly unlikely that both parents will carry the same recessive traits.
So who did Cain marry and where did she come from? It makes sense that Cain’s wife was a daughter or granddaughter of Adam and Eve.