Genesis 4:8 Cain said to his brother Abel, Let’s go out to the field.
Cain led his brother far enough away that their parents would not hear him scream. He probably gave some thought to the place, and how to dispose of the body. If his brother went missing, his parents would assume that he was lost, or was eaten by a wild animal. So While they were in the field, Cain attacked his brother Abel and killed him (Genesis 4:8b).
Cain became the first murderer, and made his brother the first martyr. Cain was not merely jealous of his brother; he hated him for loving God. Cain hated God so much that he murdered his brother for loving God. Do not be like Cain, who belonged to the evil one and murdered his brother (1 John 3:12), wrote John.
Believers and unbelievers often get along, but when the devil gets involved, we should expect the worst. If they persecuted me, they will persecute you (John 15:20), said Jesus. Abel was the first to die for his faith, but millions have followed him.
Again we see that sin may have unintended consequences. When Adam and Eve ate the forbidden fruit, they hoped to elevate the human condition (Genesis 3:5). Instead, their natures were corrupted and passed down to their children, leading one to kill the other. Even worse, their sinful natures were passed down to future generations. This has produced a world of sin and misery, where everyone dies eventually. If Adam and Eve could have foreseen the results of their sin, they wouldn’t have sinned in the first place. Many have a similar story.