Bereshith 4:6-16 The Punishment of Kayin (commentary)

Kayin of Cain is more concerned what would happen to him after he did that terrible act (of killing his brother). God, instead of making an end to Cain's life straight ahead, left Cain alive as an even more poignant sign of sin.

The figure of Eve

After having looked at Adam we cannot pass his helper Eve. It was she who brought the man to follow her idea and to ignore God's Wish not to eat from the Tree of moral, with as consequence that they got knowledge of good and evil and came to learn pain and death.