Genesis 4:15-16

15Then the Lord said to him, “Not so! If anyone kills Cain, vengeance shall be taken on him asevenfold.” And the Lord bput a mark on Cain, lest any who found him should attack him. 16Then Cain went away from the presence of the Lord and settled in the land of Nod,
 Nod means wandering
east of Eden.

Copyright information for ESV