Cain and Abel

Cain and Abel were two of Adam and Eves children.

The very first murder
Both Cain and Abel were giving offerings to God, however God only accepted Abel's offering, He saw evil in Cains heart. Because of this, Cain killed his brother. God sent Cain away, putting on him a mark telling no one to hurt him.

Where did Cain get his wife?
It is said that cain had children, but that would mean he would have to have a wife, but Adam, Eve and their children were the only people on the planet! The only explanation is that Cain married his sister.