Curse of Cain
The Curse of Cain and the mark of Cain are phrases that originated in the story of Adam and Eve in the Hebrew Bible.
In the biblical Book of Genesis, Cain and Abel are the first two sons of Adam and Eve. Cain, the firstborn, was a farmer, and his brother Abel was a shepherd. The brothers made sacrifices to God, each of his own produce, but God favored Abel's sacrifice instead of Cain's. Cain then murdered Abel, whereupon God punished Cain to a life of wandering. Cain then dwelt in the land of Nod (נוֹד, "wandering"), where he built a city and fathered the line of descendants beginning with Enoch.
The narrative never explicitly states Cain's motive for murdering his brother, nor God's reason for rejecting Cain's sacrifice, nor details on the identity of Cain's wife. Some traditional interpretations consider Cain to be the originator of evil, violence, or greed. According to Genesis, Cain was the first human born and Abel was the first to die.
In the stories, if someone did something to harm Cain, the damage would come back sevenfold. Some interpretations view this as a physical mark, whereas other interpretations see the "mark" as a sign, and not as a physical mark on Cain himself. The King James Version of the Bible reads "set a mark upon Cain."