Can you tell me from where Cain got his wife? 
Thanks,  T____

You wanted to know “from where” Cain took his wife, in Gen. 4:17.  The short answer to your question is that Cain married his own sister. Abraham also married his own half- sister Sarah (Gen. 20:12). And Amram married his own aunt (his father’s sister) (Ex. 6:2). In Gen 5:1 we are told: This is the book (record) of the generations of Adam. In other words, the generations of Adam are the male line of descent from Adam, as the one who “begat” (brought forth) sons, in order to show the family lineage. This is what we are told about Adam: And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons AND DAUGHTERS.(Gen. 5:4) And this is what we are told about Eve, in Gen. 3:20: And Adam called his wife’s name Eve; because she was the mother of all living. Or, the mother of every father’s family. During this time in the early beginning of human history, there was no God- given law against marrying within the family. In fact, marrying within the family was necessary in order to obey God’s command to: “Be fruitful, and multiply…..”, in Gen. 1:28. After Cain killed his brother Abel, there was no one else that he could have possibly taken for a wife except his own sister, “begotten” from Adam and Eve. Later on, when the law was given to Moses, these practices were disallowed. 

May the Lord be with you!