Cain’s crime is described in just a few simple words: “Cain attacked his brother Abel and killed him” (Genesis 4:8). But it has immense significance, not only for the fact that it was the world’s first murder.

Some biblical scholars believe that the way Genesis 4:8 is phrased in the original Hebrew suggests that Cain had gone looking for Abel, and killed him when he found him in the field.¹ This interpretation would make it clear that Cain’s action was premeditated. But his crime was all the more heinous because Abel had done nothing to provoke him; all Abel had done was offer to God a pleasing sacrifice (v. 4). In fact, Jesus calls him “righteous Abel” (Matthew 23:35).

Cain’s action has further significance in that it represents the breakdown of relationships between people. Sin has now led one man to take the life of another. Worse, the person whom Cain murdered was his own brother. The original audience of Genesis would have noticed the contrast between this and God’s call for them to love and care for one another. As Psalm 133:1 observes: “How good and pleasant it is when God’s people live together in unity!”

Sibling rivalry, unfortunately, is not unusual. Throughout Genesis, we will see many instances of conflict between brothers: Ishmael and Isaac, Esau and Jacob, the 12 sons of Jacob. The tragic question that Cain, the jealous and murderous brother, asks when confronted by God is: “Am I my brother’s keeper?” (Genesis 4:9).

But Genesis also offers hope. Ishmael and Isaac will come together to bury their father Abraham (25:9), Esau and Jacob will reconcile (33:4), and the book will end with Joseph’s reassuring words to his 10 older brothers who had caused him so much grief: “Don’t be afraid. I will provide for you and your children” (50:21).

In the meantime, God’s words to Cain, “Your brother’s blood cries out to me from the ground” (4:10), is the earliest reassurance to us that God remembers every victim of injustice, that He will hold each perpetrator accountable. Like the serpent and the ground (3:14, 17), Cain is now cursed. He is driven even further out than his parents, to places that will “no longer yield its crops” for him (4:11–12; see also 3:17–19).

John’s warning in 1 John 3:12 is a reminder to us that what happened to Cain and Abel can also happen in the church today. If we feel in ourselves a growing anger towards another believer, it may be the first sign that something has gone wrong in our walk with God.

¹ Victor P. Hamilton, The Book of Genesis, Chapters 1–17 (Grand Rapids, Michigan: Eerdmans, 1990), 228–230.