Cain was the firstborn son of Adam and Eve, whose name means "acquired." Driven by jealousy, he murdered his brother Abel, becoming the first murderer in Scripture—a narrative that carries enduring themes of sin, repentance, and divine mercy.
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Cain was the first child born to the patriarchs Adam and Eve (Genesis 4:1). His arrival was marked by his mother's joyful declaration, "I have gotten a man with the help of Jehovah," and his Hebrew name קַיִן (Qayin) means "acquired" or "gotten," reflecting Eve's gratitude for God's gift. In the Genesis narrative, Cain grew up alongside his younger brother Abel, and each presented an offering to the Lord according to his vocation. Cain brought an offering of the fruit of the ground, while Abel brought the firstborn of his flock and their fat. God looked with favor on Abel's offering but not on Cain's, and the distinction ignited a fatal jealousy within him. Despite the Lord's warning that "sin crouches at the door" and its desire is to overcome him, yet he may master it, Cain allowed resentment to take root. One day, while the two were in the field, he rose up against his brother and killed him (Genesis 4:8). This act marked the first murder in human history and stands as a foundational biblical warning about how sin, conceived in desire, grows until it brings death. When God confronted him with the question, "Where is Abel your brother?" Cain replied with the now-famous retort, "Am I my brother's keeper?"—a question that has echoed through the ages as a probe of human moral responsibility. Rather than executing immediate judgment, the Lord declared that whoever killed Cain would suffer vengeance sevenfold, and He appointed a sign for Cain so that no one finding him would strike him down (Genesis 4:15). This sign has often been understood as an expression of mercy and protection even amid the consequences of sin, reminding readers that grace remains available even after grave transgression. Cain's account is referenced repeatedly in Hebrews, 1 John, and Jude as a sobering illustration of faithless works and the destructive power of envy. His portrayal as a child of the evil one stands in stark contrast to Abel the righteous, making Cain a central figure in the biblical theology of sacrifice, faith, and moral accountability.