Genesis 4:13

9 And the LORD said to Cain, “Where is your brother Abel?” “I do not know!” he answered. “Am I my brother’s keeper?”

10 “What have you done?” replied the LORD. “The voice of your brother’s blood cries out to Me from the ground.

11 Now you are cursed and banished from the ground, which has opened its mouth to receive your brother’s blood from your hand.

12 When you till the ground, it will no longer yield its produce to you. You will be a fugitive and a wanderer on the earth.”

13 But Cain said to the LORD, “My punishment is greater than I can bear.

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

15 “Not so!” replied the LORD. “If anyone slays Cain, then Cain will be avenged sevenfold.” And the LORD placed a mark on Cain, so that no one who found him would kill him.

16 So Cain went out from the presence of the LORD and settled in the land of Nod, east of Eden.

17 And Cain had relations with his wife, and she conceived and gave birth to Enoch. Then Cain built a city and named it after his son Enoch.

Read all of Genesis 4