In the book of Genesis, we learn about the first murder committed by Cain, who killed his brother Abel out of jealousy. After the murder, God confronts Cain and asks him where Abel is. Cain lies to God, and in response, God punishes him by making him a wanderer on the earth. However, before Cain leaves, God also makes a strange statement: "If anyone kills Cain, he will suffer vengeance seven times over" (Genesis 4:15). Many people have wondered why God made this statement. After all, Cain had j…