What does 'thou shalt not kill' mean?

The commandment "Thou shalt not kill," found in Exodus 20:13 and Deuteronomy 5:17, is a foundational pillar of biblical ethics. A precise understanding requires examining the original Hebrew term, which is not a blanket prohibition against all forms of taking life, but specifically against unlawful, premeditated, or malicious killing. The Hebrew word used, "ratsach" (רָצַח), carries the connotation of murder, assassination, or manslaughter—the unauthorized shedding of innocent blood. This distinguishes it from other Hebrew words for killing, such as "harag" (הָרַג), which can refer to killing in war, self-defense, or judicial execution, or "mut" (מוּת), meaning simply to die or be put to death. Therefore, the commandment primarily safeguards the **sanctity of human life**, asserting that human beings, being created in the **image of God** (Genesis 1:26-27), possess intrinsic worth and are not to be arbitrarily or maliciously deprived of life. This divinely ordained value on human life prohibits personal vendettas, murder driven by hatred, and unjustified violence against fellow humans. Jesus Christ further deepened the understanding of this commandment in the **Sermon on the Mount**, as recorded in Matthew 5:21-22. He taught that the spirit of the law extends beyond the physical act of murder to encompass the internal attitudes of the heart, specifically anger and hatred towards one's brother. "You have heard that it was said to the ancient ones, 'You shall not murder;' and 'Whoever murders will be in danger of the judgment.' But I tell you that everyone who is angry with his brother without a cause will be in danger of the judgment." This demonstrates that the divine prohibition is not merely external but delves into the motivations and dispositions that precede violent acts. The commandment, therefore, calls for reverence for life, reconciliation, and the suppression of animosity, reflecting God's own character and His desire for a just and peaceful society.

The commandment "Thou shalt not kill" emerged in the context of ancient Near Eastern societies, where vendettas, inter-tribal warfare, and arbitrary acts of violence were common. While other law codes like the Code of Hammurabi (circa 1754 BC) addressed homicide, they often focused on social status in determining punishment. The Israelite Law, revealed at Mount Sinai, stands out by prohibiting "ratsach" universally, irrespective of the victim's social standing, and grounding this prohibition in the divine creation of humanity. Archaeological evidence from the region, such as city ruins and burial sites, reflects the often brutal realities of life and death in the Bronze and Iron Ages. The Decalogue provided a radical framework for a just society, elevating the value of individual human life as a direct reflection of God's own image, offering a counter-cultural ethos against the prevailing practices of indiscriminate violence and disregard for life.

The prohibition against 'ratsach' is not merely a legal injunction but a theological declaration about the nature of God and humanity. It underscores God's exclusive sovereignty over life and death, as the giver of life. By forbidding the unlawful taking of human life, the commandment affirms the sacredness of human beings as distinct creations bearing the divine image, making an assault on human life an affront to God Himself. It calls for a profound respect for every individual, recognizing their inherent dignity as reflections of the Creator.