Where did the woman come from that Cain married? If Cain was the third person on the earth a son of Adam and Eve where did other people come from?
Genesis 4:1 - 26
ESV - 1 Now Adam knew Eve his wife, and she conceived and bore Cain, saying, "I have gotten a man with the help of the Lord. 2 And again, she bore his brother Abel. Now Abel was a keeper of sheep, and Cain a worker of the ground.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
It can be said after Cain and Abel, Adam and Eve did have other children before Abel killed Cain because when Seth came, Adam was 130 yrs. Old.