Genesis 4:16-18

Then Cain went out from the presence of the LORD, and settled in the land of Nod, east of Eden. Cain had relations with his wife and she conceived, and gave birth to Enoch; and he built a city, and called the name of the city Enoch, after the name of his son. Now to Enoch was born Irad, and Irad became the father of Mehujael, and Mehujael became the father of Methushael, and Methushael became the father of Lamech.