Genesis 4:13 - 14
ESV - 13 Cain said to the Lord, "My punishment is greater than I can bear. 14 Behold, you have driven me today away from the ground, and from your face I shall be hidden. I shall be a fugitive and a wanderer on the earth, and whoever finds me will kill me.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.