Genesis 4:14-18

Behold, You have driven me this day from the face of the ground; and I will be hidden from Your face, and I will be a wanderer and a drifter on the earth, and whoever finds me will kill me.”

So the Lord said to him, “Therefore whoever kills Cain, vengeance will be taken on him seven times as much.” And the Lord placed a mark on Cain, so that no one finding him would kill him.

Then Cain left 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 Cain built a city, and named the city Enoch, after the name of his son.

Now to Enoch was born Irad, and Irad fathered Mehujael, and Mehujael fathered Methushael, and Methushael fathered Lamech.