Genesis 4:9-15 New Revised Standard Version (NRSV)
9 Then the Lord said to Cain, “Where is your brother Abel?” He said, “I do not know; am I my brother’s keeper?” 10 And the Lord said, “What have you done? Listen; your brother’s blood is crying out to me from the ground! 11 And now you are cursed 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 to you its strength; you will be a fugitive and a wanderer on the earth.” 13 Cain said to the Lord, “My punishment is greater than I can bear! 14 Today you have driven me away from the soil, and I shall be hidden from your face; I shall be a fugitive and a wanderer on the earth, and anyone who meets me may kill me.” 15 Then the Lord said to him, “Not so![a] Whoever kills Cain will suffer a sevenfold vengeance.” And the Lord put a mark on Cain, so that no one who came upon him would kill him.