The Torah presents a puzzling phrase in (Exodus 22:2): "If the sun shone upon him." The context is a homeowner who kills a thief caught breaking in at night. During the night, the homeowner is permitted to use lethal force — the assumption is that a nighttime intruder poses a mortal threat. But "if the sun shone upon him," the law changes. The homeowner who kills the thief during daylight is liable for murder.
The Mekhilta immediately challenges the literal reading. Does the sun shine upon this thief alone? Does it not shine upon the whole world? Obviously, "if the sun shone upon him" cannot be a simple statement about the time of day. It must mean something deeper.
The answer is a legal metaphor. "Just as the sun is peace for the world" — sunlight represents clarity, openness, and the absence of hidden danger — "so this one, the thief." The verse asks: is the thief's intention as clear and peaceful as daylight? If the homeowner knows that the thief is "at peace with him" — meaning the thief has no intention of killing, and the homeowner is aware of this — then killing the thief is murder.
The critical factor is the homeowner's knowledge. If the homeowner knows the intruder poses no lethal threat but kills him anyway, the homeowner is fully liable. The Torah uses the image of sunlight not to specify a time of day but to describe a state of knowledge. When the situation is as clear as day — when you know the other person means you no harm — lethal force is forbidden.
This interpretation transforms a seemingly literal verse into one of the Torah's most sophisticated teachings about self-defense, proportional force, and the moral obligation to assess a threat before responding with violence.