Genesis 4:10-16

But the LORD said, “What have you done? Listen! Your brother’s blood cries out to me from the ground! Now you are cursed and banished from the ground, which has swallowed your brother’s blood. No longer will the ground yield good crops for you, no matter how hard you work! From now on you will be a homeless wanderer on the earth.” Cain replied to the LORD, “My punishment is too great for me to bear! You have banished me from the land and from your presence; you have made me a homeless wanderer. Anyone who finds me will kill me!” The LORD replied, “No, for I will give a sevenfold punishment to anyone who kills you.” Then the LORD put a mark on Cain to warn anyone who might try to kill him. So Cain left the LORD’s presence and settled in the land of Nod, east of Eden.