Judaism views self-defense not only as a right, but as a strict obligation. Rooted in the Talmudic principle of
rodef (the pursuer), the teaching mandates: "If someone comes to kill you, rise and kill him first" (Sanhedrin 72a).
However, this right to self-preservation comes with distinct moral and legal limits: [1, 2, 3, 4, 5]
- Strict Proportionality: You may only use the minimum amount of force necessary to neutralize the threat. If an attacker can be stopped by disarming them or maiming a limb, using lethal force is considered a punishable transgression (Sanhedrin 74a). [1, 2, 3]
- Imminent Threat Requirement: Force is only justified when facing an immediate, active danger. For example, a homeowner can use lethal force against an intruder at night because a resident will naturally fight back, escalating the situation. However, if it is absolutely clear the intruder poses no danger (or if they are retreating), using lethal force becomes an act of bloodshed (Exodus 22:1-2). [1, 2, 3]
- The "Rule of the Red Blood": While you must protect your own life, you cannot intentionally murder an innocent third party to save yourself. The Talmud states, "How do you know that your blood is redder than his?"—meaning no one has the moral authority to calculate whose life is more valuable.