Genesis 4:11 (KJV)

And the LORD said unto Cain, Why art thou wroth? and why is thy countenance fallen?

If thou doest well, shalt thou not be accepted? and if thou doest not well, sin lieth at the door. And unto thee shall be his desire, and thou shalt rule over him.

And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him.

And the LORD said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother's keeper?

And he said, What hast thou done? the voice of thy brother's blood crieth unto me from the ground.

When thou tillest the ground, it shall not henceforth yield unto thee her strength; a fugitive and a vagabond shalt thou be in the earth.

And Cain said unto the LORD, My punishment is greater than I can bear.

Behold, thou hast driven me out this day from the face of the earth; and from thy face shall I be hid; and I shall be a fugitive and a vagabond in the earth; and it shall come to pass, that every one that findeth me shall slay me.

And the LORD said unto him, Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold. And the LORD set a mark upon Cain, lest any finding him should kill him.

And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden.