The Torah states plainly: "He shall be put to death." But where? Under whose authority? Left unqualified, these words might mean that anyone could carry out the execution — a mob, a vigilante, a single enraged relative of the victim. The Mekhilta immediately clarifies: the execution must take place in beth-din, a properly constituted court of law.
But the Mekhilta does not simply assert this. It asks: could the verse mean something else? Could "he shall be put to death" refer to execution outside a court? The answer comes from (Numbers 35:12): "And the slayer shall not die until he stand before the congregation for judgment." This verse makes it explicit — no one can be executed without first standing trial before an assembled court. The right to take a life belongs to the judicial system alone.
Having established this through the Numbers verse, the Mekhilta circles back to the original phrase: what, then, is the intent of "he shall be put to death"? The answer: in beth-din. The phrase is not a license for extrajudicial killing. It is a directive to the court. The court must impose the death penalty when the law requires it.
This passage reflects one of the deepest commitments in Jewish legal thinking — the absolute necessity of due process. Even in capital cases, especially in capital cases, the accused has the right to stand before judges, to have witnesses examined, and to receive a verdict through proper legal channels. The Torah's command to execute is simultaneously a command to judge fairly. No death without a trial. No punishment without a court. The Mekhilta makes this principle unassailable by grounding it in Scripture itself.