Genesis 4:15

¹³  And Cain said unto the LORD, My punishment is greater than I can bear.

¹⁴  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.

¹⁵  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.

¹⁶  And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden.

¹⁷  And Cain knew his wife; and she conceived, and bare Enoch: and he builded a city, and called the name of the city, after the name of his son, Enoch.