Genesis 4:16-18

Then Cain went out from the presence of the LORD and dwelt in the land of Nod on the east of Eden. And Cain knew his wife, and she conceived and bore Ē´noch. And he built a city, and called the name of the city after the name of his son—Ē´noch. To Ē´noch was born Irad; and Irad begot Mehujael, and Mehujael begot Methushael, and Methushael begot Lamech.