It wasn't all pain and misery, however, because along came the world's first children. Cain was born first and then Abel followed. Just like that, the human population of planet earth had doubled. Despite the pain of leaving Eden, Adam and Eve now got to experience the joy of parenthood.
Other than the fact that they were born to the same parents, Cain and Abel could not have been more different. They had completely different interests and styles. Abel tended to flocks while Cain became a farmer.
They were hungry for God's approval and both set out to offer a sacrifice to their creator. Their differences in character were starkly displayed in the form of the sacrifices they offered to God.
Cain offered a sacrifice of vegetables, but God rejected it. Abel, on the other hand, offered the best portions from the firstborn of his flock. God accepted his sacrifice, which infuriated Cain who attacked and killed his brother in a jealous rage. The world now had its first murderer.
Cain was banished to a nomadic existence. But God was merciful and protected him.