Genesis 4:16-18

And Cain went out from the presence of Jehovah, and dwelt in the land of Nod, on the east of Eden. 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. And unto Enoch was born Irad: and Irad begat Mehujael; and Mehujael begat Methushael; and Methushael begat Lamech.