Genesis 4:14–15

14 Since you are banishing me today from the face of the earth, and I must hide from your presence and become a restless wanderer on the earth, whoever finds me will kill me.”a. 15 Then the Lord replied to him, “In that case,E whoever kills Cain will suffer vengeance seven times over.” And he placed a markb on Cain so that whoever found him would not kill him.