What was the curse of Cain?

He would be a fugitive and a vagabond

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.

And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand;

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. Genesis 4:9-12