‏ Genesis 4:17

17Then Cain knew his wife, and she conceived and gave birth to Enoch. And he built a city, and he called its name by the name of his son, Enoch.
4:17 His wife: She was a daughter of Adam, and Cain’s own sister; God dispensing with such marriages in the beginning of the world, as mankind could not otherwise be propagated.(Challoner)
,
4:17 He built a city: In process of time, when his race was multiplied, so as to be numerous enough to people it. For in the many hundred years he lived, his race might be multiplied even to millions.(Challoner)
Copyright information forCPDV