When Cain killed his brother he did not know what he should do with his body, so Allah sent a crow digging a hole in the earth to bury therein a dead crow; to show Cain how he should bury the corpse of his brother? so Cain wondered, and said: "Am I unable that I do like the doing of this crow so I cover the private part of my brother?" then Cain buried his brother, then Allah punished him with regret after he returned with loss.