Originally Posted by meadowbrook

Cain and Abel were the children of Adam and Eve. Cain killed Abel. He wasn't doomed to wander the earth forever.
Here's what happened next:
"The Lord said, "What have you done? Listen; your brother's blood is crying out to me from the ground! 11 And now you are cursed from the ground, which has opened its mouth to receive your brother's blood from your hand. 12 When you till the ground, it will no longer yield to you its strength; you will be a fugitive and a wanderer on the earth." 13 Cain said to the Lord, "My punishment is greater than I can bear! 14 Today you have driven me away from the soil, and I shall be hidden from your face; I shall be a fugitive and a wanderer on the earth, and anyone who meets me may kill me." 15 Then the Lord said to him, "Not so! Whoever kills Cain will suffer a sevenfold vengeance." And the Lord put a mark on Cain, so that no one who came upon him would kill him. 16 Then Cain went away from the presence of the Lord, and settled in the land of Nod, east of Eden."
(From Genesis 4)