Today: Genesis 4 The Testimony of the Blood. In Gen. 4 we find the account of the first violent taking of a man's life. Adam's firstborn Cain takes the life of Abel, his brother out of rage and jealousy. In the midst of this terrible act, a redemptive truth is found. Abel's blood has a voice that God hears and responds to, which reflects for us the power that is in the blood of Jesus, shed for our sins.