Gen 4:8

4:8 spoke to Abel. Ignoring God and His warning, Cain’s subsequent actions reveal his answer. Abel is mentioned only for his birth, offering, and death.

killed him. The fracturing of family ties by sin, begun in ch. 3, quickly reaches the extreme of murder. Seeking autonomy from God like his parents (3:6 note), Cain usurps divine sovereignty over life.