Q. Where Did Cain Get His Wife?
A. The answer is in Genesis 5:4. “And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters.”
Adam and Eve had many sons and daughters that are not named in Genesis and Cain obviously married one of his sisters. This was not wrong in the early days of the human race, because the gene pool was not weakened as it is today.
Dr. Duane Gish states: “Since Adam and Eve were genetically perfect when created, and harmful, crippling mutations had not yet had time to form, at least to a significant extent when such intermarriage was necessary, no harmful biological results would occur from such intermarriage. Today almost 3000 crippling conditions, such as juvenile diabetes, sickle cell anaemia, and phenylketonuria, are caused by harmful mutant genes. Chances of inheriting such a mutant gene from both father and mother (which is usually necessary for expression of the defect) is increased by intermarriage with cousins or closer relatives. Thus came prohibition against such intermarriage”